[177lu] lutetium-PSMA i&t composition and dosimetry, kit, method of making, and method of using thereof

Abstract

The present disclosure relates to a radiopharmaceutical compositions, methods, and kits comprising 177Lu-PSMA I&T. The composition may be formulated as a solution for injection and the solution is suitable for administration at least 72 hours after formulation. The composition(s) have a radiochemical purity (RCP) of 95% or greater, 95.5% or greater, 96% or greater, 96.5% or greater, 97% or greater, 97.5% or greater, 98.0% or greater, 98.5% or greater, 99% or greater, or 99.5% or greater at administration.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application claims priority to the following U.S. Provisional Application Nos. 63 / 671,633, 63 / 671,625, 63 / 677,137 and 63 / 677,276 filed Jul. 15, 2024, Jul. 15, 2024, Jul. 30, 2024, and Jul. 30, 2024, respectively, which are all hereby incorporated by reference in their entirety, including all tables, figures, and claims. This application is also a continuation in-part (CIP) of U.S. Ser. No. 18 / 791,300, filed Jul. 31, 2024, which claims priority to the following U.S. Provisional Application Nos. 63 / 529,986, 63 / 620,262, 63 / 626,839, 63 / 671,633, 63 / 671,625, 63 / 677,137 and 63 / 677,276 filed Jul. 31, 2023, Jan. 12, 2024, Jan. 30, 2024, Jul. 15, 2024, Jul. 15, 2024, Jul. 30, 2024, and Jul. 30, 2024, respectively, which are all hereby incorporated by reference in their entirety, including all tables, figures, and claims. U.S. Ser. No. 18 / 791,300, filed Jul. 15, 2023, is also a CIP of U.S. Ser. No. 18 / 228,510, filed Jul. 31, 2023, which claims priority to U.S. Provisional Application No. 63 / 393,446, filed Jul. 29, 2022, which are all hereby incorporated by reference in their entirety, including all tables, figures, and claims.FIELD

[0002] The present disclosure relates to a composition of a [177Lu]Lutetium-PSMA I&T ([177Lu]Lu-PSMA I&T or 177Lu-PSMA I&T) solution for injection or intravenous infusion, as well as a kit comprising 177Lu-PSMA I&T. The 177Lu-PSMA I&T solution and / or kit thereof may be used for prostate cancer radioligand therapy (PRLT).BACKGROUND

[0003] Prostate cancer (PC) is the most frequent non-cutaneous cancer and the second most frequent cause of cancer deaths for adult men. Overall, increasing the survival rate for patients with metastatic castration-resistant prostate cancer (mCRPC) is challenging and there exists a clinical need for an effective treatment method for mCRPC patients.

[0004] Prostate-specific membrane antigen (PSMA) is highly expressed on prostate epithelial cells and strongly up-regulated in prostate cancer, which makes PSMA a promising molecular target for diagnosis and therapy of PC including, mCRPC. [177Lu]Lu-PSMA-617 and [177Lu]Lu-PSMA I&T are small molecule inhibitors of PSMA that are extremely desirable for targeted radionuclide therapy due to their low toxicity. However, the use of these small molecule inhibitors targeting PSMA with 177Lu to treat prostate cancer can also result in undesirable absorbed doses of radiation to healthy organs.

[0005] There continues to be a need for an improved formulation containing [177Lu]Lu-PSMA I&T that can be administered to patients which minimizes undesired cumulative absorbed doses of radiation to the patients' healthy organ tissue that is not being targeted for the treatment of cancer. Provided herein are solutions to overcome these and other problems in the art by providing an improved [177Lu]Lu-PSMA I&T composition for PC and mCRPC treatment. Further, provided herein is an improved [177Lu]Lu-PSMA I&T composition that provides lower cumulative absorbed dose of radiation, on a per administration basis.BRIEF SUMMARY

[0006] Provided herein, inter alia, are compositions directed to a radiopharmaceutical composition comprising 177Lu-PSMA I&T for administration to a human patient in need thereof. The compositions are formulated as solutions for injection and the solutions are suitable for administration to a human patient in need thereof more than 48 hours, more than 72 hours, more than 96 hours, or more than 100 hours after formulation. The compositions are formulated as solutions for injection and the solutions radiochemical purity of ≥95% at least 48 hours after formulation, at least 72 hours after formulation, at least 96 hours after formulation, at least 100 hours after formulation, or at least 120 hours after formulation.

[0007] The compositions, methods, and kits described herein comprise 177Lu-PSMA I&T suitable for administration to a human patient wherein the healthy organs exhibit reduced cumulative absorbed dose post administration.

[0008] The compositions, methods, and kits described herein comprise 177Lu-PSMA I&T suitable for administration to a human patient at radiochemical purity of ≥95% and having a molar ratio of the PSMA I&T to 177Lu that is from 2.0:1.0 to 8.0:1.0, and / or from 4.0:1.0 to 8.0:1.0, and / or from 4.4:1.0 to 7.6:1.0. This is highly surprising and unexpected because our own initial testing suggested that this embodiment would not be feasible, and that a molar ratio of the PSMA I&T to 177Lu of at least 11.0:1.0 or more would be required to maintain a radiochemical purity≥95% for 72 hours or more. Indeed, according to our own initial expectations, anything below a ratio of 11.0:1.0 would likely have an unacceptable radiochemical purity (e.g., below 95%) at formation, and would continue to deteriorate such that it would be further unacceptable for a human patient at 24 hours after formation, 48 hours at formation, 72 hours after formation, or 96 hours after formation.

[0009] Yet, utilizing the unique parameters described herein, the compositions, methods, and kits described herein comprising 177Lu-PSMA I&T suitable for administration to a human patient at radiochemical purity of ≥95% and having a molar ratio of the PSMA I&T to 177Lu that is 2.0:1.0 to 8.0:1.0, and / or from 4.0:1.0 to 8.0:1.0, and / or from 4.4:1.0 to 7.6:1.0, wherein the composition is stable for 72 hours or more, are provided herein.

[0010] In another embodiment, the compositions, methods, and kits described herein comprise 177Lu-PSMA I&T suitable for administration to a human patient at radiochemical purity of ≥95% and having a PSMA I&T to [177Lu]Lu3+ ratio (in μg:mCi) from about 0.20 to about 0.60. In another embodiment, the compositions, methods, and kits described herein comprise 177Lu-PSMA I&T suitable for administration to a human patient at radiochemical purity of ≥95% and having a PSMA I&T to [177Lu]Lu3+ ratio (in μg:mCi)≤0.60. This is also a highly surprising and unexpected because our own initial testing suggested that this embodiment would not be feasible, and having a PSMA I&T to [177Lu]Lu3+ ratio (in μg:mCi) of at least 0.70 or greater would be required to maintain a radiochemical purity≥95% for 72 hours or more. Yet, utilizing the unique parameters described herein, the compositions, methods, and kits described herein comprising 177Lu-PSMA I&T suitable for administration to a human patient at radiochemical purity of ≥95% and having a PSMA I&T to [177Lu]Lu3+ ratio (in μg:mCi) of from about 0.20 to about 0.64, from about 0.20 to about 0.63, from about 0.20 to about 0.62, from about 0.20 to about 0.61, or from about 0.20 to about 0.60, wherein the composition is stable for 72 hours or more, are provided herein.

[0011] The present disclosure is further directed to a radiopharmaceutical composition comprising [177Lu]Lu-PSMA I&T and ascorbic acid at a pH of 3.0 to 6.0 in solution. In some examples, the composition is suitable for administration to a human patient in need thereof at least 90 hours after formulation, and the composition has a radiochemical purity of 95.0% or greater at administration. In some aspects, the radiopharmaceutical composition may comprise a metal scavenger or chelating agent. The metal scavenger or chelating agent may comprise DTPA, EDTA, EDDS, DFOA, or a combination thereof. In other embodiments, the metal scavenger or chelating agent may comprise DTPA and an absence of EDTA. In some aspects, the radiopharmaceutical composition may comprise an absence of gentisic acid and / or gentisate (i.e., no gentisic acid or gentisate).

[0012] Another aspect of the present disclosure is a reaction composition comprising [177Lu] LuCl3, about 463 to 500 μg / mL PSMA I&T precursor in an ascorbic acid and acetate buffer. Another aspect of the present disclosure is a reaction composition comprising [177Lu]LuCl3, about 463 to 500 μg / mL PSMA I&T precursor, about 4 ml 0.4 M sodium acetate, about 1.6 mL 0.05 M hydrochloric acid, and about 150 μl 20% L-ascorbic acid in a total of 6 to 8 mL of solution. In yet another aspect of the present disclosure is a reaction composition comprising 177Lu, about 463 to 1000 μg / mL PSMA I&T precursor in an ascorbic acid and acetate buffer. In some examples, the reaction composition has a 177Lu radioactivity≤61 GBq.

[0013] Another aspect of the present disclosure is a reaction composition comprising [177Lu]Lu−, PSMA I&T precursor, ascorbic acid, acetate buffer, hydrochloric acid, and L-ascorbic acid in a solution. In some examples, the reaction composition has a 177Lu radioactivity≤296 GBq (i.e., ≤8,000 mCi).

[0014] The present disclosure is further directed to a radiopharmaceutical composition comprising [177Lu]Lu-PSMA I&T solution for injection comprising [177Lu]Lu-PSMA I&T and related substances (i.e., unlabeled PSMA I&T and PSMA I&T labeled with other metals) in an amount from about 3 μg / ml to about 16 μg / ml, ascorbic acid in a concentration from about 25 mg / ml to about 40 mg / ml, and a chelating agent in an amount from about 0.075 mg / ml to 0.15 mg / ml, wherein pH of the solution is between about 3 and about 5, wherein the total volume of the composition is about 15 ml and wherein upon administration of the composition to a subject, the subject maintains low levels of hematotoxic and nephrotoxic toxicity. The present disclosure is also further directed to a radiopharmaceutical composition comprising [177Lu]Lu-PSMA I&T solution for injection comprising [177Lu]Lu-PSMA I&T and related substances (i.e., unlabeled PSMA I&T and PSMA I&T labeled with other metals) in an amount from about 1 μg / ml to about 8 μg / ml, ascorbic acid in a concentration from about 25 mg / ml to about 40 mg / ml, and a chelating agent in an amount from about 0.075 mg / ml to 0.15 mg / ml, wherein pH of the solution is between about 3 and about 5, wherein the total volume of the composition is about 15 ml and wherein upon administration of the composition to a subject, the subject maintains low levels of hematotoxic and nephrotoxic toxicity. The present disclosure is also further directed to a radiopharmaceutical composition comprising [177Lu]Lu-PSMA I&T solution for injection comprising [177Lu]Lu-PSMA I&T and related substances (i.e., unlabeled PSMA I&T and PSMA I&T labeled with other metals) in an amount from about 3 μg / ml to about 10 μg / ml, ascorbic acid in a concentration from about 25 mg / ml to about 40 mg / ml, and a chelating agent in an amount from about 0.075 mg / ml to 0.15 mg / ml, wherein pH of the solution is between about 3 and about 5, wherein the total volume of the composition is about 15 ml and wherein upon administration of the composition to a subject, the subject maintains low levels of hematotoxic and nephrotoxic toxicity.

[0015] The present disclosure is further directed to a radiopharmaceutical composition comprising [177Lu]Lu-PSMA I&T solution for injection comprising [177Lu]Lu-PSMA I&T, ascorbic acid, and ethanol. Wherein the [177Lu]Lu-PSMA I&T is in sufficient amounts of radioactivity for intended use, wherein the total amount of ascorbic acid in the solution is about 210-700 mg and the total amount of ethanol in the solution is about 274-706 mg; wherein pH of the solution is about 5 or below, wherein upon administration of the composition to a subject, the subject maintains low levels of hematotoxic and nephrotoxic toxicity, and wherein the prostate-specific antigen decline is more than about 50%.

[0016] The present disclosure is further directed to a radiopharmaceutical composition comprising [177Lu]Lu-PSMA I&T solution for injection comprising [177Lu]Lu-PSMA-I&T in an amount from about 3 μg / ml to about 15 μg / ml, ascorbic acid in a concentration from about 10 mg / ml to about 50 mg / ml, and ethanol in a concentration of about 0% (v / v), about 1% (v / v) to about 10% (v / v), about 2.5% (v / v %) to about 8.5% (v / v %), about 3.0% (v / v %) to about 8.0% (v / v %), about 3.8% (v / v %) to about 7.5% (v / v %), or about 4.5% (v / v %) to about 7.0% (v / v %) ethanol, wherein pH of the solution is between about 3 and about 5, and wherein upon administration of the composition to a subject, the subject maintains low levels of hematotoxic and nephrotoxic toxicity.

[0017] The present disclosure is further directed to a radiopharmaceutical composition comprising [177Lu]Lu-PSMA I&T solution for injection comprising [177Lu]Lu-PSMA I&T in an amount from about 3 μg / ml to about 15 μg / ml, or about 3 μg / ml to about 12 μg / ml; ascorbic acid in a concentration from about 10 mg / ml to about 50 mg / ml, ethanol in a concentration of about 0% (v / v) to about 10% (v / v), and a chelating agent in an amount from about 0.01 mg / ml to about 0.15 mg / ml or about, wherein pH of the solution is between about 3 and about 5, and wherein upon administration of the composition to a subject, the subject maintains low levels of hematotoxic and nephrotoxic toxicity.

[0018] The present disclosure is further directed to a radiopharmaceutical composition comprising [177Lu]Lu-PSMA I&T solution for injection comprising [177Lu]Lu-PSMA I&T and related substances (i.e., unlabeled PSMA I&T and PSMA I&T labeled with other metals) in an amount from about 4 μg / ml to about 15 μg / ml, ascorbic acid in a concentration from about 25 mg / ml to about 40 mg / ml, and a chelating agent in an amount from about 0.075 mg / ml to 0.15 mg / ml, wherein pH of the solution is between about 3 and about 5, wherein the total volume of the composition is about 15 ml and wherein upon administration of the composition to a subject, the subject maintains low levels of hematotoxic and nephrotoxic toxicity.

[0019] The present disclosure is further related to a radiopharmaceutical kit, comprising a vial containing at least a single dose of a [177Lu]Lu-PSMA I&T solution for injection to a human patient in need thereof, wherein the injection comprises a dose of [177Lu]Lu-PSMA-I&T, and wherein [177Lu]Lu-PSMA I&T treatment with 1, 2, 3, 4, 5, 6, 7, 8 or more cycles at the dose is possible without the risk of kidney toxicities and / or wherein [177Lu]Lu-PSMA I&T treatment with 1, 2, 3, 4, 5, 6, 7, 8 or more cycles provides a mean projected dose that is below a cumulative absorbed dose to the kidneys of 23 Gy.

[0020] The present disclosure is further related to a radiopharmaceutical kit, comprising a vial containing at least a single dose of a [177Lu]Lu-PSMA I&T solution for injection to a human patient in need thereof, wherein the injection comprises a dose of [177Lu]Lu-PSMA-I&T, and wherein [177Lu]Lu-PSMA I&T treatment with 1, 2, 3, 4, 5, 6, 7, or 8 or more cycles at the dose that is below a cumulative absorbed dose to the kidneys of 23 Gy and / or wherein [177Lu]Lu-PSMA I&T treatment with 1, 2, 3, 4, 5, 6, 7, or 8 or more cycles provides a mean projected cumulative absorbed dose to the kidneys of ≤23.0 Gy, ≤22.9 Gy, ≤22.8 Gy, ≤22.7 Gy, ≤22.6 Gy, ≤22.5 Gy, ≤22.4 Gy, ≤22.3 Gy, ≤22.2 Gy, ≤22.1 Gy, ≤22.0 Gy, ≤21.9 Gy, ≤21.8 Gy, ≤21.7 Gy, ≤21.6 Gy, ≤21.5 Gy, ≤21.4 Gy, ≤21.3 Gy, ≤21.2 Gy, ≤21.1 Gy, ≤21.0 Gy, ≤20.9 Gy, ≤20.8 Gy, ≤20.7 Gy, ≤20.6 Gy, ≤20.5 Gy, ≤20.4 Gy, ≤20.3 Gy, ≤20.2 Gy, ≤20.1 Gy, ≤20.0 Gy, ≤19.9 Gy, ≤19.8 Gy, ≤19.7 Gy, ≤19.6 Gy, ≤19.5 Gy, ≤19.4 Gy, ≤19.3 Gy, ≤19.2 Gy, or ≤19.1 Gy.

[0021] The present disclosure is further related to a radiopharmaceutical kit, comprising a vial containing at least a single dose of a [177Lu]Lu-PSMA I&T solution for injection to a human patient in need thereof, wherein the injection comprises a dose of [177Lu]Lu-PSMA-I&T, and wherein [177Lu}Lu-PSMA I&T treatment with 1, 2, 3, 4, 5, 6, 7, or 8 or more cycles at the dose is possible without the risk of kidney toxicities and / or wherein [177Lu]Lu-PSMA I&T treatment with 1, 2, 3, 4, 5, 6, 7, or 8 or more cycles provides a mean projected cumulative absorbed dose to the kidneys of ≤19.2 Gy, ≤19.1 Gy, ≤19.0 Gy, ≤18.9 Gy, ≤18.8 Gy, ≤18.7 Gy, ≤18.6 Gy, ≤18.5 Gy, ≤18.4 Gy, ≤18.3 Gy, ≤18.2 Gy, ≤18.1 Gy, ≤18.0 Gy, ≤17.9 Gy, ≤17.8 Gy, ≤17.7 Gy, ≤17.6 Gy, ≤17.5 Gy, ≤17.4 Gy, ≤17.3 Gy, ≤17.2 Gy, ≤17.1 Gy, ≤17.0 Gy, ≤16.8 Gy, ≤16.7 Gy, ≤16.6 Gy, ≤16.5 Gy, ≤16.4 Gy, ≤16.3 Gy, ≤16.2 Gy, ≤16.1 Gy, ≤16.0 Gy, or ≤15.9 Gy.

[0022] The present disclosure is further related to a radiopharmaceutical kit, comprising a vial containing at least a single dose of a [177Lu]Lu-PSMA I&T solution for injection to a human patient in need thereof, wherein the injection comprises a dose of [177Lu-PSMA-I&T, and wherein [177Lu]Lu-PSMA I&T treatment with 1, 2, 3, 4, 5, 6, 7, or 8 or more cycles at the dose is possible without the risk of kidney toxicities and / or wherein [177Lu]Lu-PSMA I&T treatment with 1, 2, 3, 4, 5, 6, 7, or 8 or more cycles provides a mean projected dose that has a cumulative absorbed dose to the kidneys of ≤15.8 Gy, ≤15.7 Gy, ≤15.6 Gy, ≤15.5 Gy, ≤15.4 Gy, ≤15.3 Gy, ≤15.2 Gy, ≤15.1 Gy, ≤15.0 Gy, ≤14.9 Gy, ≤14.8 Gy, ≤14.7 Gy, ≤14.6 Gy, ≤14.3 Gy, ≤14.2 Gy, ≤14.1 Gy, ≤14.0 Gy, ≤13.9 Gy, ≤13.8 Gy, ≤13.7 Gy, ≤13.6 Gy, ≤13.5 Gy, ≤13.4 Gy, ≤13.3 Gy, ≤13.2 Gy, ≤13.1 Gy, ≤13.0 Gy, ≤12.9 Gy, ≤12.8 Gy, or ≤12.7 Gy.

[0023] The present disclosure is further related to a radiopharmaceutical kit, comprising a vial containing at least a single dose of a [177Lu]Lu-PSMA I&T solution for injection to a human patient in need thereof, wherein the injection comprises a dose of [177Lu]Lu-PSMA-I&T, and wherein [177Lu]Lu-PSMA I&T treatment with 1, 2, 3, 4, 5, 6, 7, or 8 or more cycles at the dose is possible without the risk of kidney toxicities and / or wherein [177Lu]Lu-PSMA I&T treatment with 1, 2, 3, 4, 5, 6, 7, or 8 or more cycles provides a mean projected dose that has a cumulative absorbed dose to the kidneys of ≤12.6 Gy, ≤12.5 Gy, ≤12.4 Gy, ≤12.3 Gy, ≤12.2 Gy, ≤12.1 Gy, ≤12.0 Gy, ≤11.9 Gy, ≤11.8 Gy, ≤11.7 Gy, ≤11.6 Gy, ≤11.5 Gy, ≤11.4 Gy, ≤11.3 Gy, ≤11.2 Gy, ≤11.1 Gy, ≤11.0 Gy, ≤10.9 Gy, ≤10.8 Gy, ≤10.7 Gy, ≤10.6 Gy, ≤10.5 Gy, ≤10.4 Gy, ≤10.3 Gy, ≤10.2 Gy, ≤10.1 Gy, ≤10.0 Gy, ≤9.9 Gy, ≤9.8 Gy, ≤9.7 Gy, ≤9.6 Gy, or ≤9.5 Gy.

[0024] The present disclosure is further related to a radiopharmaceutical kit, comprising a vial containing at least a single dose of a [177Lu]Lu-PSMA I&T solution for injection to a human patient in need thereof, wherein the injection comprises a dose of [177Lu]Lu-PSMA-I&T, and wherein [177Lu]Lu-PSMA I&T treatment with 1, 2, 3, 4, 5, 6, 7, or 8 or more cycles at the dose is possible without the risk of kidney toxicities and / or wherein [177Lu]Lu-PSMA I&T treatment with 1, 2, 3, 4, 5, 6, 7, or 8 or more cycles provides a mean projected dose that has a cumulative absorbed dose to the kidneys of ≤9.4 Gy, ≤9.3 Gy, ≤9.2 Gy, ≤9.1 Gy, ≤9.0 Gy, ≤8.9 Gy, ≤8.8 Gy, ≤8.7 Gy, ≤8.6 Gy, ≤8.5 Gy, ≤8.4 Gy, ≤8.3 Gy, ≤8.2 Gy, ≤8.1 Gy, ≤8.0 Gy, ≤7.9 Gy, ≤7.8 Gy, ≤7.7 Gy, ≤7.6 Gy, ≤7.5 Gy, ≤7.3 Gy, ≤7.2 Gy, ≤7.1 Gy, ≤7.0 Gy, ≤6.9 Gy, ≤6.8 Gy, ≤6.7 Gy, ≤6.6 Gy, ≤6.5 Gy, or ≤6.4 Gy.

[0025] The present disclosure is further related to a radiopharmaceutical kit, comprising a vial containing at least a single dose of a [177Lu]-PSMA I&T solution for injection to a human patient in need thereof, wherein the injection comprises a dose of [177Lu]Lu-PSMA-I&T, and wherein [177Lu]Lu-PSMA I&T treatment with 1, 2, 3, 4, 5, 6, 7, or 8 or more cycles at the dose is possible without the risk of kidney toxicities and / or wherein [177Lu]Lu-PSMA I&T treatment with 1, 2, 3, 4, 5, 6, 7, or 8 or more cycles provides a mean projected dose that has a cumulative absorbed dose to the kidneys of ≤6.3 Gy, ≤6.2 Gy, ≤6.1 Gy, ≤6.0 Gy, ≤5.9 Gy, ≤5.8 Gy, ≤5.7 Gy, ≤5.6 Gy, ≤5.5 Gy, ≤5.4 Gy, ≤5.3 Gy, ≤5.2 Gy, ≤5.1 Gy, ≤5.0 Gy, ≤4.9 Gy, ≤4.8 Gy, ≤4.7 Gy, ≤4.6 Gy, ≤4.5 Gy, ≤4.3 Gy, ≤4.2 Gy, ≤4.1 Gy, ≤4.0 Gy, ≤3.9 Gy, ≤3.8 Gy, ≤3.7 Gy, ≤3.6 Gy, ≤3.5 Gy, ≤3.4 Gy, ≤3.3 Gy, or ≤3.2 Gy.

[0026] The present disclosure is also related to a radiopharmaceutical kit, comprising a vial containing at least a single dose of a [177Lu]Lu-PSMA I&T solution for injection to a human patient in need thereof, wherein the injection comprises a dose of [177Lu]Lu-PSMA-I&T, and the projected or actual cumulative absorbed dose to the kidneys at 1, 2, 3, 4, 5, 6, 7, or 8 or more cycles is less than 23 Gy and no renal toxicities are observed.

[0027] The present disclosure is further related to a radiopharmaceutical kit, comprising a vial containing at least a single dose of a [177Lu]Lu-PSMA I&T solution for injection to a human patient in need thereof, wherein the injection comprises less than 10 mg / ml gentisate, gentisic acid, alternative antioxidant, or a combination thereof. In some embodiments, the injection comprises ≤9.5 mg / ml, ≤9 mg / ml, ≤8.5 mg / ml, ≤8 mg / ml, ≤7.5 mg / ml, ≤7 mg / ml, ≤6.5 mg / ml, ≤6 mg / ml, ≤5.5 mg / ml, 5 mg / ml, ≤4.5 mg / ml, ≤4 mg / ml, ≤3.5 mg / ml, ≤3 mg / ml, ≤2.5 mg / ml, ≤2 mg / ml, ≤1.5 mg / ml, ≤1 mg / ml, or ≤0.5 mg / ml gentisate, gentisic acid, alternative antioxidant, or a combination thereof. In one embodiment, the present disclosure is related to a radiopharmaceutical kit comprising a vial containing at least a single dose of a [177Lu]Lu-PSMA I&T solution for injection to a human patient in need thereof, wherein the injection comprises no gentisate, gentisic acid, alternative antioxidant, or a combination thereof.

[0028] The present disclosure is further related to a radiopharmaceutical kit, comprising a vial containing at least a single dose of a 177Lu-PSMA I&T solution for injection to a human patient in need thereof, wherein the injection comprises less than 10 mg / ml ascorbate, ascorbic acid, alternative stabilizer or radioprotectant, or a combination thereof. In some embodiments, the injection comprises ≤40 mg / ml, ≤35 mg / ml, ≤33 mg / ml, ≤31 mg / ml, ≤30 mg / ml, ≤25 mg / ml, ≤20 mg / ml, ≤15 mg / ml, ≤10 mg / ml, ≤9.5 mg / ml, ≤9 mg / ml, ≤8.5 mg / ml, ≤8 mg / ml, ≤7.5 mg / ml, ≤7 mg / ml, ≤6.5 mg / ml, ≤6 mg / ml, ≤5.5 mg / ml, 5 mg / ml, ≤4.5 mg / ml, ≤4 mg / ml, ≤3.5 mg / ml, ≤3 mg / ml, ≤2.5 mg / ml, ≤2 mg / ml, ≤1.5 mg / ml, ≤1 mg / ml, or ≤0.5 mg / ml ascorbate, ascorbic acid, alternative stabilizer, or a combination thereof.

[0029] The present disclosure is further related to a radiopharmaceutical kit, comprising a vial containing at least a single dose of a [177Lu]Lu-PSMA I&T solution for injection to a human patient in need thereof, wherein the injection comprises: (1) less than 10 mg / ml gentisate and or gentisic acid; and (2) less than 10 mg / ml ascorbate and / or ascorbic acid. In some embodiments, the injection comprises: (1)≤9.5 mg / ml, ≤9 mg / ml, ≤8.5 mg / ml, ≤8 mg / ml, ≤7.5 mg / ml, ≤7 mg / ml, ≤6.5 mg / ml, ≤6 mg / ml, ≤5.5 mg / ml, 5 mg / ml, ≤4.5 mg / ml, ≤4 mg / ml, ≤3.5 mg / ml, ≤3 mg / ml, ≤2.5 mg / ml, ≤2 mg / ml, ≤1.5 mg / ml, ≤1 mg / ml, or ≤0.5 mg / ml gentisate and / or gentisic acid; and, (2)≤9.5 mg / ml, ≤9 mg / ml, ≤8.5 mg / ml, ≤8 mg / ml, ≤7.5 mg / ml, ≤7 mg / ml, ≤6.5 mg / ml, ≤6 mg / ml, ≤5.5 mg / ml, 5 mg / ml, ≤4.5 mg / ml, ≤4 mg / ml, ≤3.5 mg / ml, ≤3 mg / ml, ≤2.5 mg / ml, ≤2 mg / ml, ≤1.5 mg / ml, ≤1 mg / ml, or ≤0.5 mg / ml ascorbate and / or ascorbic acid.

[0030] The present disclosure is further related to a radiopharmaceutical kit, comprising a vial containing at least a single dose of a [177Lu]Lu-PSMA I&T solution for injection to a human patient in need thereof, wherein the injection comprises: (1) less than 10 mg / ml antioxidant; and, (2) less than 40 mg / ml stabilizer. In some embodiments, the injection comprises: (1) ≤9.5 mg / ml, ≤9 mg / ml, ≤8.5 mg / ml, ≤8 mg / ml, ≤7.5 mg / ml, ≤7 mg / ml, ≤6.5 mg / ml, ≤6 mg / ml, ≤5.5 mg / ml, 5 mg / ml, ≤4.5 mg / ml, ≤4 mg / ml, ≤3.5 mg / ml, ≤3 mg / ml, ≤2.5 mg / ml, ≤2 mg / ml, ≤1.5 mg / ml, ≤1 mg / ml, or ≤0.5 mg / ml antioxidant; and, (2)≤40 mg / ml, ≤35 mg / ml, ≤33 mg / ml, ≤31 mg / ml, ≤30 mg / ml, ≤25 mg / ml, ≤20 mg / ml, ≤15 mg / ml, ≤10 mg / ml, ≤9.5 mg / ml, ≤9 mg / ml, ≤8.5 mg / ml, ≤8 mg / ml, ≤7.5 mg / ml, ≤7 mg / ml, ≤6.5 mg / ml, ≤6 mg / ml, ≤5.5 mg / ml, 5 mg / ml, ≤4.5 mg / ml, ≤4 mg / ml, ≤3.5 mg / ml, ≤3 mg / ml, ≤2.5 mg / ml, ≤2 mg / ml, ≤1.5 mg / ml, ≤1 mg / ml, or ≤0.5 mg / ml stabilizer.

[0031] The present disclosure is further related to a radiopharmaceutical kit, comprising a vial containing at least a single dose of a [177Lu]Lu-PSMA I&T solution for injection to a human patient in need thereof, wherein the injection comprises a 6.8 GBq±0.10 GBq dose, 6.8 GBq±0.15 GBq dose, 6.8 GBq±0.20 GBq dose, 6.8 GBq±0.25 GBq dose, or 6.8 GBq±0.30 GBq dose, and wherein [177Lu]Lu-PSMA I&T treatment with 1, 2, 3, 4, 5, 6, 7, or 8 cycles at the dose is possible without the risk of kidney toxicities and / or wherein [177Lu]Lu-PSMA I&T treatment with 1, 2, 3, 4, 5, 6, 7, or 8 cycles provides a mean projected dose that is below a cumulative absorbed dose to the kidneys of 23 Gy and / or the projected or actual cumulative absorbed dose to the kidneys at 1, 2, 3, 4, 5, 6, 7, or 8 cycles is less than 23 Gy and no renal toxicities are observed.

[0032] The present disclosure is further related to a radiopharmaceutical kit, comprising a vial containing at least a single dose of a [177Lu]Lu-PSMA I&T solution for injection to a human patient in need thereof, wherein the injection comprises a 7.4 GBq±0.10 GBq dose, 7.4 GBq±0.15 GBq dose, 7.4 GBq±0.20 GBq dose, 7.4 GBq±0.25 GBq dose, or 7.4 GBq±0.30 GBq dose, and wherein [177Lu]Lu-PSMA I&T treatment with 1, 2, 3, 4, 5, 6, 7, or 8 cycles at the dose is possible without the risk of kidney toxicities and / or wherein [177Lu]Lu-PSMA I&T treatment with 1, 2, 3, 4, 5, 6, 7, or 8 cycles provides a mean projected dose that is below a cumulative absorbed dose to the kidneys of 23 Gy and / or the projected or actual cumulative absorbed dose to the kidneys at 1, 2, 3, 4, 5, 6, 7, or 8 cycles is less than 23 Gy and no renal toxicities are observed.

[0033] The present disclosure is further related to a radiopharmaceutical kit, comprising a vial containing at least a single dose of a 177Lu-PSMA I&T solution for injection to a human patient in need thereof, wherein the injection comprises a 7.4 GBq (mean 7.52±0.16 GBq) dose of 177Lu-PSMA-I&T, and wherein 177Lu-PSMA I&T treatment with 1, 2, 3, 4, 5, 6, 7, or 8 cycles at the dose is possible without the risk of kidney toxicities and / or wherein 177Lu-PSMA I&T treatment with 1, 2, 3, 4, 5, 6, 7, or 8 cycles provides a mean projected dose that is below a cumulative absorbed dose to the kidneys of 23 Gy and / or the projected or actual cumulative absorbed dose to the kidneys at 1, 2, 3, 4, 5, 6, 7, or 8 cycles is less than 23 Gy and no renal toxicities are observed. The present disclosure is also further related to a radiopharmaceutical kit, comprising a vial containing at least a single dose of a 177Lu-PSMA I&T solution for injection to a human patient in need thereof, wherein the injection comprises a 7.4 GBq (mean 7.52±0.16 GBq) dose of 177Lu-PSMA-I&T, wherein 177Lu-PSMA I&T treatment with 1, 2, 3, 4, 5, 6, 7, or 8 cycles provides a mean projected dose that is below a cumulative absorbed dose to the kidneys of 23 Gy and / or the projected or actual cumulative absorbed dose to the kidneys at 1, 2, 3, 4, 5, 6, 7, or 8 cycles is less than 23 Gy and no renal toxicities are observed.

[0034] The present disclosure is also further related to a radiopharmaceutical kit, comprising a vial containing at least a single dose of a 177Lu-PSMA I&T solution for injection to a human patient in need thereof, wherein the injection comprises a 6.8 GBq±10% GBq dose, 6.8 GBq±5% GBq dose, or 6.8 GBq±3% GBq dose of 177Lu-PSMA-I&T, and wherein 177Lu-PSMA I&T treatment with 1, 2, 3, 4, 5, 6, 7, or 8 cycles at the dose is possible without the risk of kidney toxicities and / or wherein 177Lu-PSMA I&T treatment with 1, 2, 3, 4, 5, 6, 7, or 8 cycles provides a mean projected dose that is below a cumulative absorbed dose to the kidneys of 23 Gy and / or the projected or actual cumulative absorbed dose to the kidneys at 1, 2, 3, 4, 5, 6, 7, or 8 cycles is less than 23 Gy and no renal toxicities are observed.

[0035] The present disclosure is also further related to a radiopharmaceutical kit, comprising a vial containing at least a single dose of a 177Lu-PSMA I&T solution for injection to a human patient in need thereof, wherein the injection comprises a 7.4 GBq±10% GBq dose, 7.4 GBq±5% GBq dose, or 7.4 GBq±3% GBq dose of 177Lu-PSMA-I&T, and wherein 177Lu-PSMA I&T treatment with 1, 2, 3, 4, 5, 6, 7, or 8 cycles at the dose is possible without the risk of kidney toxicities and / or wherein 177Lu-PSMA I&T treatment with 1, 2, 3, 4, 5, 6, 7, or 8 cycles provides a mean projected dose that is below a cumulative absorbed dose to the kidneys of 23 Gy and / or the projected or actual cumulative absorbed dose to the kidneys at 1, 2, 3, 4, 5, 6, 7, or 8 cycles is less than 23 Gy and no renal toxicities are observed.

[0036] The present disclosure is also further related to a radiopharmaceutical kit, comprising a vial containing at least a single dose of a 177Lu-PSMA I&T solution for injection to a human patient in need thereof, wherein the injection comprises a 7.4 (±10%) GBq dose of 177Lu-PSMA-I&T, and wherein 177Lu-PSMA I&T treatment with 6 cycles at the dose is possible without the risk of kidney toxicities and / or wherein 177Lu-PSMA I&T treatment with 6 cycles provides a mean projected dose that is below a cumulative absorbed dose to the kidneys of 23 Gy and / or the projected or actual cumulative absorbed dose to the kidneys at 6 cycles is less than 23 Gy and no renal toxicities are observed.

[0037] The present disclosure is further related to a radiopharmaceutical kit, comprising a vial containing at least a single dose of a 177Lu-PSMA I&T solution for injection to a human patient in need thereof, wherein the injection comprises a 7.4 GBq±0.10 GBq dose, 7.4 GBq±0.15 GBq dose, 7.4 GBq±0.20 GBq dose, 7.4 GBq±0.25 GBq dose, or 7.4 GBq±0.30 GBq dose, and wherein the projected cumulative absorbed dose to the kidneys at 6 cycles will be 20.4±10.2 Gy. The present disclosure is further related to a radiopharmaceutical kit, comprising a vial containing at least a single dose of a 177Lu-PSMA I&T solution for injection to a human patient in need thereof, wherein the injection comprises a 7.5 GBq±0.10 GBq dose, 7.5 GBq±0.15 GBq dose, 7.5 GBq±0.20 GBq dose, 7.5 GBq±0.25 GBq dose, or 7.5 GBq±0.30 GBq dose, and wherein the projected cumulative absorbed dose to the kidneys at 6 cycles will be 20.4±10.2 Gy.

[0038] The present disclosure is further related to a radiopharmaceutical kit, comprising a vial containing at least a single dose of a 177Lu-PSMA I&T solution for injection to a human patient in need thereof, wherein the injection comprises a 7.1 GBq±0.10 GBq dose, 7.1 GBq±0.15 GBq dose, 7.1 GBq±0.20 GBq dose, 7.1 GBq±0.25 GBq dose, or 7.1 GBq±0.30 GBq dose, and wherein the projected cumulative absorbed dose to the kidneys at 6, 7 or 8 cycles will be 20.4±10.2 Gy.

[0039] The present disclosure is further related to a radiopharmaceutical kit, comprising a vial containing at least a single dose of a 177Lu-PSMA I&T solution for injection to a human patient in need thereof, wherein the injection comprises a 6.8 GBq±0.10 GBq dose, 6.8 GBq±0.15 GBq dose, 6.8 GBq±0.20 GBq dose, 6.8 GBq±0.25 GBq dose, or 6.8 GBq±0.30 GBq dose, and wherein the projected cumulative absorbed dose to the kidneys at 6, 7 or 8 cycles will be 20.4±10.2 Gy.

[0040] The present disclosure is further related to a radiopharmaceutical kit, comprising a vial containing at least a single dose of a 177Lu-PSMA I&T solution for injection to a human patient in need thereof, wherein the injection comprises a 6.5 GBq±0.10 GBq dose, 6.5 GBq±0.15 GBq dose, 6.5 GBq±0.20 GBq dose, 6.5 GBq±0.25 GBq dose, or 6.5 GBq±0.30 GBq dose, and wherein the projected cumulative absorbed dose to the kidneys at 6 7 or 8 cycles will be 20.4±10.2 Gy.

[0041] The present disclosure is further related to a radiopharmaceutical kit, comprising a vial containing at least a single dose of a 177Lu-PSMA I&T solution for injection to a human patient in need thereof, wherein the injection comprises a 7.4 GBq±0.10 GBq dose, 7.4 GBq±0.15 GBq dose, 7.4 GBq±0.20 GBq dose, 7.4 GBq±0.25 GBq dose, or 7.4 GBq±0.30 GBq dose, and wherein the projected cumulative absorbed dose to the kidneys at 6 or 7 cycles will be ≤23.00 Gy, ≤22.50 Gy, ≤22.00 Gy, ≤21.50 Gy, ≤21.00 Gy, ≤20.50 Gy, or ≤20.40 Gy. The present disclosure is further related to a radiopharmaceutical kit, comprising a vial containing at least a single dose of a 177Lu-PSMA I&T solution for injection to a human patient in need thereof, wherein the injection comprises a 7.5 GBq±0.10 GBq dose, 7.5 GBq±0.15 GBq dose, 7.5 GBq±0.20 GBq dose, 7.5 GBq±0.25 GBq dose, or 7.5 GBq±0.30 GBq dose, and wherein the projected cumulative absorbed dose to the kidneys at 6 or 7 cycles will be ≤23.00 Gy, ≤22.50 Gy, ≤22.00 Gy, ≤21.50 Gy, ≤21.00 Gy, ≤20.50 Gy, or ≤20.40 Gy.

[0042] The present disclosure is further related to a radiopharmaceutical kit, comprising a vial containing at least a single dose of a 177Lu-PSMA I&T solution for injection to a human patient in need thereof, wherein the injection comprises a 6.8 GBq±0.10 GBq dose, 6.8 GBq±0.15 GBq dose, 6.8 GBq±0.20 GBq dose, 6.8 GBq±0.25 GBq dose, or 6.8 GBq±0.30 GBq dose, and wherein the projected cumulative absorbed dose to the kidneys at 6, 7 or 8 cycles will be ≤23.00 Gy, ≤22.50 Gy, ≤22.00 Gy, ≤21.50 Gy, ≤21.00 Gy, ≤20.50 Gy, or ≤20.40 Gy.

[0043] The present disclosure is further related to a radiopharmaceutical kit, comprising a vial containing at least a single dose of a 177Lu-PSMA I&T solution for injection to a human patient in need thereof, wherein the injection comprises a 7.4 GBq±0.10 GBq dose, 7.4 GBq±0.15 GBq dose, 7.4 GBq±0.20 GBq dose, 7.4 GBq±0.25 GBq dose, or 7.4 GBq±0.30 GBq dose, and wherein a mean absorbed dose of the radiopharmaceutical is about 0.1 Gy / MBq to 1.0 Gy / MBq in the kidney of the human patient. The present disclosure is further related to a radiopharmaceutical kit, comprising a vial containing at least a single dose of a 177Lu-PSMA I&T solution for injection to a human patient in need thereof, wherein the injection comprises a 7.5 GBq±0.10 GBq dose, 7.5 GBq±0.15 GBq dose, 7.5 GBq±0.20 GBq dose, 7.5 GBq±0.25 GBq dose, or 7.5 GBq±0.30 GBq dose, and wherein a mean absorbed dose of the radiopharmaceutical is about 0.1 Gy / MBq to 1.0 Gy / MBq in the kidney of the human patient.

[0044] The present disclosure is further related to a radiopharmaceutical kit, comprising a vial containing at least a single dose of a 177Lu-PSMA I&T solution for injection to a human patient in need thereof, wherein the injection comprises a 6.8 GBq±0.10 GBq dose, 6.8 GBq±0.15 GBq dose, 6.8 GBq±0.20 GBq dose, 6.8 GBq±0.25 GBq dose, or 6.8 GBq±0.30 GBq dose, and wherein a mean absorbed dose of the radiopharmaceutical is about 0.1 Gy / MBq to 1.0 Gy / MBq in the kidney of the human patient.

[0045] The present disclosure is further related to a radiopharmaceutical kit, comprising a vial containing at least a single dose of a 177Lu-PSMA I&T solution for injection to a human patient in need thereof, wherein the injection comprises a 7.4 GBq±0.10 GBq dose, 7.4 GBq±0.15 GBq dose, 7.4 GBq±0.20 GBq dose, 7.4 GBq±0.25 GBq dose, or 7.4 GBq±0.30 GBq dose, and wherein a mean whole body effective dose of the radiopharmaceutical composition is about 0.001 mSv / MBq to 0.1 mSv / MBq. The present disclosure is further related to a radiopharmaceutical kit, comprising a vial containing at least a single dose of a 177Lu-PSMA I&T solution for injection to a human patient in need thereof, wherein the injection comprises a 7.5 GBq±0.10 GBq dose, 7.5 GBq±0.15 GBq dose, 7.5 GBq±0.20 GBq dose, 7.5 GBq±0.25 GBq dose, or 7.5 GBq±0.30 GBq dose, and wherein a mean whole body effective dose of the radiopharmaceutical composition is about 0.001 mSv / MBq to 0.1 mSv / MBq.

[0046] The present disclosure is further related to a radiopharmaceutical kit, comprising a vial containing at least a single dose of a 177Lu-PSMA I&T solution for injection to a human patient in need thereof, wherein the injection comprises a 6.8 GBq±0.10 GBq dose, 6.8 GBq±0.15 GBq dose, 6.8 GBq±0.20 GBq dose, 6.8 GBq±0.25 GBq dose, or 6.8 GBq±0.30 GBq dose, and wherein a mean whole body effective dose of the radiopharmaceutical composition is about 0.001 mSv / MBq to 0.1 mSv / MBq.

[0047] The present disclosure is further related to a method of administering a radiopharmaceutical composition, the method comprising administering the radiopharmaceutical composition into a human patient in need thereof, optionally administering more than 48 hours after formulation, the radiopharmaceutical composition comprising a 7.4 GBq±0.10 GBq dose, 7.4 GBq±0.15 GBq dose, 7.4 GBq±0.20 GBq dose, 7.4 GBq±0.25 GBq dose, or 7.4 GBq±0.30 GBq dose of 177Lu-PSMA I&T in a solution comprising a pH of 3.5 to 5.0, the solution optionally comprising ascorbic acid and / or ethanol, and the solution optionally comprising a radiochemical purity of more than 95%, more than 96% more than 97%, more than 98%, more than 99%, or more than 99.5% when administered, and wherein 177Lu-PSMA I&T treatment with 1, 2, 3, 4, 5, 6, and / or 7 cycles at the dose is possible without the risk of kidney toxicities and / or wherein 177Lu-PSMA I&T treatment with 1, 2, 3, 4, 5, 6, and / or 7 cycles provides a mean projected dose that is below a cumulative absorbed dose to the kidney of 23 Gy and / or the projected or actual cumulative absorbed dose to the kidneys at 1, 2, 3, 4, 5, 6, and / or 7 cycles is less than 23 Gy and no renal toxicities are observed. In another aspect, the radiopharmaceutical composition may comprise radionuclidic identification (gamma spectrometry) of the composition showing gamma ray energy peaks at 113±2 keV and 208±4 keV, and no other significant peaks with gamma energy>100 keV are detected.

[0048] The present disclosure is further related to a method of administering a radiopharmaceutical composition, the method comprising administering the radiopharmaceutical composition into a human patient in need thereof, optionally administering more than 48 hours after formulation, the radiopharmaceutical composition comprising a 6.8 GBq±0.10 GBq dose, 6.8 GBq±0.15 GBq dose, 6.8 GBq±0.20 GBq dose, 6.8 GBq±0.25 GBq dose, or 6.8 GBq±0.30 GBq dose of [177Lu]Lu-PSMA I&T in a solution comprising a pH of 3.5 to 4.5, the solution optionally comprising ascorbic acid and / or ethanol, and the solution optionally comprising a radiochemical purity of more than 95%, more than 96% more than 97%, more than 98%, more than 99%, or more than 99.5% when administered, and wherein [177Lu]Lu-PSMA I&T treatment with 1, 2, 3, 4, 5, 6, 7 and / or 8 cycles at the dose is possible without the risk of kidney toxicities and / or wherein 177Lu-PSMA I&T treatment with 1, 2, 3, 4, 5, 6, 7 and / or 8 cycles provides a mean projected dose that is below a cumulative absorbed dose to the kidney of 23 Gy and / or the projected or actual cumulative absorbed dose to the kidneys at 1, 2, 3, 4, 5, 6, 7 and / or 8 cycles is less than 23 Gy and no renal toxicities are observed. In another aspect, the radiopharmaceutical composition may comprise radionuclidic identification (gamma spectrometry) of the composition showing gamma ray energy peaks at 113±2 keV and 208±4 keV, and no other significant peaks with gamma energy>100 keV are detected.

[0049] The present disclosure is further related to a method of administering a radiopharmaceutical composition, the method comprising administering the radiopharmaceutical composition into a human patient in need thereof, optionally administering more than 48 hours after formulation, the radiopharmaceutical composition comprising a 6.5 GBq±0.10 GBq dose, 6.5 GBq±0.15 GBq dose, 6.5 GBq±0.20 GBq dose, 6.5 GBq±0.25 GBq dose, or 6.5 GBq±0.30 GBq dose of 177Lu-PSMA I&T in a solution comprising a pH of 3.5 to 5.0, the solution optionally comprising ascorbic acid and / or ethanol, and the solution optionally comprising a radiochemical purity of more than 95%, more than 96% more than 97%, more than 98%, more than 99%, or more than 99.5% when administered, and wherein 177Lu-PSMA I&T treatment with 1, 2, 3, 4, 5, 6, and / or 7 cycles at the dose is possible without the risk of kidney toxicities and / or wherein 177Lu-PSMA I&T treatment with 1, 2, 3, 4, 5, 6, 7 and / or 8 cycles provides a mean projected dose that is below a cumulative absorbed dose to the kidney of 23 Gy and / or the projected or actual cumulative absorbed dose to the kidneys at 1, 2, 3, 4, 5, 6, 7 and / or 8 cycles is less than 23 Gy and no renal toxicities are observed. In another aspect, the radiopharmaceutical composition may comprise radionuclidic identification (gamma spectrometry) of the composition showing gamma ray energy peaks at 113±2 keV and 208±4 keV, and no other significant peaks with gamma energy>100 keV are detected.

[0050] The present disclosure is further related to a radiopharmaceutical kit comprising a vial containing at least a single dose of a 177Lu-PSMA I&T solution for injection to a human patient in need thereof, wherein the injection comprises a 7.4 GBq±0.10 GBq dose, 7.4 GBq±0.15 GBq dose, 7.4 GBq±0.20 GBq dose, 7.4 GBq±0.25 GBq dose, or 7.4 GBq±0.30 GBq dose, and wherein the radionuclidic identification (gamma spectrometry) of the solution shows gamma ray energy peaks at 113±2 keV and 208±4 keV, and no other significant peaks with gamma energy>100 keV are detected.

[0051] The present disclosure is also related to a method comprising administering to a human patient in need thereof a radiopharmaceutical composition comprising 177Lu-PSMA I&T that provides a mean absorbed dose to the patient's kidneys of 0.41±0.18 Gy / GBq, 0.41±0.17 Gy / GBq, 0.41±0.16 Gy / GBq, 0.41±0.15 Gy / GBq, 0.41±0.14 Gy / GBq, 0.41±0.13 Gy / GBq, 0.41±0.12 Gy / GBq, 0.41±0.11 Gy / GBq, 0.41±0.10 Gy / GBq, 0.41±0.09 Gy / GBq, 0.41±0.08 Gy / GBq, 0.41±0.07 Gy / GBq, 0.41±0.06 Gy / GBq, 0.41±0.05 Gy / GBq, 0.41±0.04 Gy / GBq, 0.41±0.03 Gy / GBq, 0.41±0.02 Gy / GBq, or 0.41±0.01 Gy / GBq, and wherein the radionuclidic identification (gamma spectrometry) of the solution shows gamma ray energy peaks at 113±2 keV and 208±4 keV, and no other significant peaks with gamma energy>100 keV are detected. The disclosure also relates to a method comprising administering to a human patient in need thereof a radiopharmaceutical composition comprising 177Lu-PSMA I&T that provides a mean absorbed dose to the patient's kidneys that is ≤0.70 Gy / GBq, ≤0.65 Gy / GBq, ≤0.60 Gy / GBq, ≤0.55 Gy / GBq, ≤0.50 Gy / GBq, ≤0.45 Gy / GBq, ≤0.40 Gy / GBq, ≤0.35 Gy / GBq, ≤0.30 Gy / GBq, or ≤0.25 Gy / GBq.

[0052] The present disclosure also relates to a method comprising administering to a human patient in need thereof a radiopharmaceutical composition comprising 177Lu-PSMA I&T that provides a mean absorbed dose to the patient's salivary glands that is 0.19±0.18 Gy / GB, 0.19±0.17 Gy / GBq, 0.19±0.16 Gy / GBq, 0.19±0.15 Gy / GBq, 0.19±0.14 Gy / GBq, 0.19±0.13 Gy / GBq, 0.19±0.12 Gy / GBq, 0.19±0.11 Gy / GBq, or 0.19±0.10 Gy / GBq. The present disclosure is also related to a method comprising administering to a human patient in need thereof a radiopharmaceutical composition comprising 177Lu-PSMA I&T that provides a mean absorbed dose to the patient's salivary glands that is ≤0.30 Gy / GBq, ≤0.25 Gy / GBq, ≤0.25 Gy / GBq, ≤0.20 Gy / GBq, ≤0.15 Gy / GBq, ≤0.10 Gy / GBq, or ≤0.05 Gy / GBq.

[0053] The present disclosure also relates to a method comprising administering to a human patient in need thereof a radiopharmaceutical composition comprising 177Lu-PSMA I&T that provides a mean absorbed dose to the patient's lacrimal glands that is 0.40±0.40 Gy / GBq, 0.40±0.39 Gy / GBq, 0.40±0.38 Gy / GBq, 0.40±0.37 Gy / GBq, 0.40±0.36 Gy / GBq, 0.40±0.35 Gy / GBq, 0.40±0.34 Gy / GBq, 0.40±0.33 Gy / GBq, 0.40±0.32 Gy / GBq, 0.40±0.31 Gy / GBq, 0.40±0.30 Gy / GBq, 0.40±0.29 Gy / GBq, 0.40±0.28 Gy / GBq, 0.40±0.27 Gy / GBq, 0.40±0.26 Gy / GBq, 0.40±0.25 Gy / GBq, 0.40±0.24 Gy / GBq, 0.40±0.23 Gy / GBq, 0.40±0.22 Gy / GBq, 0.40±0.21 Gy / GBq, 0.40±0.20 Gy / GBq, 0.40±0.19 Gy / GBq, 0.40±0.18 Gy / GBq, 0.40±0.17 Gy / GBq, 0.40±0.16 Gy / GBq, 0.40±0.15 Gy / GBq, 0.40±0.14 Gy / GBq, 0.40±0.13 Gy / GBq, 0.40±0.12 Gy / GBq, 0.40±0.11 Gy / GBq, 0.40±0.10 Gy / GBq, 0.40±0.09 Gy / GBq, 0.40=0.08 Gy / GBq, 0.40±0.07 Gy / GBq, 0.40±0.06 Gy / GBq, 0.40±0.05 Gy / GBq, 0.40±0.04 Gy / GBq, 0.40±0.03 Gy / GBq, 0.40±0.02 Gy / GBq, or 0.40±0.01 Gy / GBq. The present disclosure also relates to a method comprising administering to a human patient in need thereof a radiopharmaceutical composition comprising 177Lu-PSMA I&T that provides a mean absorbed dose to the patient's lacrimal glands that is ≤1.10 Gy / GBq, ≤1.05 Gy / GBq, ≤1.00 Gy / GBq, ≤0.95 Gy / GBq, ≤0.90 Gy / GBq, ≤0.85 Gy / GBq, ≤0.80 Gy / GBq, ≤0.75 Gy / GBq, ≤0.70 Gy / GBq, ≤0.65 Gy / GBq, ≤0.60 Gy / GBq, ≤0.55 Gy / GBq, ≤0.50 Gy / GBq, ≤0.45 Gy / GBq, ≤0.40 Gy / GBq, or ≤0.35 Gy / GBq.

[0054] The present disclosure also relates to a method comprising administering to a human patient in need thereof a radiopharmaceutical composition comprising 177Lu-PSMA I&T that provides a mean absorbed dose to the patient's liver that is 0.04±0.10 Gy / GBq, 0.04±0.09 Gy / GBq, 0.04±0.08 Gy / GBq, 0.04±0.07 Gy / GBq, 0.04±0.06 Gy / GBq, 0.04±0.05 Gy / GBq, 0.04±0.04 Gy / GBq, 0.04±0.03 Gy / GBq, 0.04±0.02 Gy / GBq, or 0.04±0.01 Gy / GBq. The present disclosure also relates to a method comprising administering to a human patient in need thereof a radiopharmaceutical composition comprising 177Lu-PSMA I&T that provides a mean absorbed dose to the patient's liver that is ≤0.10 Gy / GBq, ≤0.09 Gy / GBq, ≤0.08 Gy / GBq, ≤0.07 Gy / GBq, ≤0.06 Gy / GBq, ≤0.05 Gy / GBq, ≤0.04 Gy / GBq, ≤0.03 Gy / GBq, ≤0.02 Gy / GBq, or ≤0.01 Gy / GBq.

[0055] The present disclosure is also related to a method comprising administering to a human patient in need thereof a radiopharmaceutical composition comprising 177Lu-PSMA I&T that provides a mean absorbed dose to the patient's kidneys that is ≤0.70 Gy / GBq, a mean absorbed dose to the patient's lacrimal glands that is ≤1.10 Gy / GBq, and a mean absorbed dose to the patient's salivary glands that is ≤0.30 Gy / GBq. In another aspect, the present disclosure related to a method comprising administering to a human patient in need thereof a radiopharmaceutical composition comprising 177Lu-PSMA I&T that provides a mean absorbed dose to the patient's kidneys that is ≤0.60 Gy / GBq, a mean absorbed dose to the patient's lacrimal glands that is ≤1.00 Gy / GBq, and a mean absorbed dose to the patient's salivary glands that is ≤0.25 Gy / GBq. In addition, the present disclosure relates to a method comprising administering to a human patient in need thereof a radiopharmaceutical composition comprising 177Lu-PSMA I&T that provides a mean absorbed dose to the patient's kidneys that is ≤0.50 Gy / GBq, a mean absorbed dose to the patient's lacrimal glands that is ≤0.90 Gy / GBq, and a mean absorbed dose to the patient's salivary glands that is ≤0.20 Gy / GBq.

[0056] The present disclosure is further related to a method of diagnosing or treating a tumor of a patient in need thereof, the method comprising administering by injection a radiopharmaceutical composition comprising 177Lu-PSMA I&T and ascorbic acid at a pH of 3.5 to 5.0 in solution, wherein 20 hours after injection the radiopharmaceutical composition has an activity of at least 20% IA to 30% IA in the whole body.

[0057] The present disclosure is further related to a method of diagnosing a tumor of a patient in need thereof, the method comprising administering to the patient by injection a radiopharmaceutical composition comprising 177Lu-PSMA I&T and ascorbic acid at a pH of 3.5 to 4.5 in solution, wherein less than 20 hours after injection the radiopharmaceutical composition has an activity of at least 8% IA to 10% IA in the kidneys.

[0058] The present disclosure is further related to a method of diagnosing a tumor in a patient in need thereof, the method comprising administering to the patient by injection a radiopharmaceutical composition comprising 177Lu-PSMA I&T and ascorbic acid at a pH of 3.5 to 4.5 in solution, wherein less than 20 hours after injection the radiopharmaceutical composition has an activity of at least 0.7% IA to 1% IA in the parotid glands.

[0059] The present disclosure is further related to a method of diagnosing a tumor in a patient in need thereof, the method comprising administering to the patient by injection a radiopharmaceutical composition comprising 177Lu-PSMA I&T and ascorbic acid at a pH of 3.5 to 4.5 in solution, wherein less than 20 hours after injection the radiopharmaceutical composition has an activity of at least 0.2% IA to 0.5% IA in lymph node lesions of the patient.

[0060] The present disclosure is further related to a method of diagnosing a tumor in a patient in need thereof, the method comprising administering to the patient by injection a radiopharmaceutical composition comprising 177Lu-PSMA I&T and ascorbic acid at a pH of 3.5 to 4.5 in solution, wherein less than 20 hours after injection the radiopharmaceutical composition has an activity of at least 0.1% IA to 0.4% IA in bone lesions of the patient.

[0061] The present disclosure is further related to a method of diagnosing a tumor in a patient in need thereof, the method comprising administering to the patient by injection a radiopharmaceutical composition comprising 177Lu-PSMA I&T and ascorbic acid at a pH of 3.5 to 4.5 in solution, wherein the radiopharmaceutical composition has an effective half-life of about 30 hours to 40 hours in the whole body of the patient.

[0062] Various refinements exist of the features noted above in relation to the various aspects of the present disclosure. Further features may also be incorporated in these various aspects as well. These refinements and additional features may exist individually or in any combination. For instance, various features discussed below in relation to one or more of the illustrated embodiments may be incorporated into any of the above-described aspects of the present disclosure alone or in any combination. Again, the brief summary presented above is intended only to familiarize the reader with certain aspects and contexts of the present disclosure without limitation to the claimed subject matter.BRIEF DESCRIPTION OF THE FIGURES

[0063] Various features, aspects, and advantages of the present disclosure will become better understood when the following detailed description is read with reference to the accompanying figures in which like characters represent like parts throughout the figures, wherein:

[0064] FIG. 1A presents the structural formula of the precursor PSMA I&T.

[0065] FIG. 1B presents the structural formula for the R isomer of 177Lu-PSMA I&T. However, the PSMA I&T doesn't have a specification for enantiomeric purity of R and S isomers.

[0066] FIG. 2 is a flowchart representation of an example method of preparing the disclosed radiopharmaceutical composition.

[0067] FIG. 3A is a flowchart of the synthetic procedure of the 177Lu-PSMA I&T in one embodiment.

[0068] FIG. 3B is a flowchart of the synthetic procedure of the 177Lu-PSMA I&T in one embodiment.

[0069] FIG. 4 depicts a drawing of an example product vial. The drug product is delivered in a sterile pyrogen free glass vial of Type 1 glass with a fluorocoated bromobutyl rubber septum. The septum is sealed with a crimped aluminum capsule. During transportation, the glass vial containing the radiopharmaceutical is kept in a lead shielded container. The transport container including lead shield and outer packaging complies to type A requirements (IAEA standards).

[0070] FIG. 5 shows [177Lu]Lu-PSMA I&T radiochemical purity measured by HPLC at different time points.

[0071] FIGS. 6A and 6B show HPLC radio-chromatograms of high radioactivity concentration formulation containing 42.5 mg / ml ascorbic acid at pH of 7±0.1, 0 hours and 71 hours post EOS as detailed in example 3.

[0072] FIGS. 7A and 7B show HPLC radio-chromatograms of high radioactivity concentration formulation containing 42.4 mg / ml ascorbic acid at pH of 4.5±0.1, 0 hours and 71 hours post end of synthesis (“EOS”) as detailed in example 3.

[0073] FIGS. 8A and 8B show HPLC radio-chromatograms of high radioactivity concentration formulation containing 42.5 mg / ml ascorbic acid at pH of 3.5±0.1, 0 hours and 90 hours post EOS as detailed in example 3.

[0074] FIGS. 9A and 9B show HPLC radio-chromatograms of low radioactivity concentration formulation containing 21 mg / ml ascorbic acid at pH of 4.5±0.1, 0 hours and 92 hours post EOS as detailed in example 3.

[0075] FIGS. 10A and 10B show HPLC radio-chromatograms of low radioactivity concentration formulation containing 31 mg / ml ascorbic acid at pH of 5±0.1, 0 hours and 71 hours post EOS as detailed in example 3.

[0076] FIGS. 11A and 11B show HPLC radio-chromatograms of low radioactivity concentration formulation containing 31 mg / ml ascorbic acid at pH of 4.5±0.1, 0 hours and 93 hours post EOS as detailed in example 3.

[0077] FIG. 12 presents the baseline and on-treatment disease status evaluation and treatment decisions.

[0078] FIG. 13 presents time activity curves for all region of interest (ROI) delineated organs in one embodiment. Data (dots) represent averages over the 12 subjects analyzed.

[0079] FIG. 14 presents the mean time-integrated activity coefficients (TIAC) and standard deviations (SD) for all delineated region for the first 6 patients in one embodiment.

[0080] FIG. 15 presents maximum intensity projection of the SPECT / CT images acquired for one subject at 4 h, 24 h, 48 h, and 168 h post injection in one embodiment.

[0081] FIG. 16 presents mean TIAC and SD for all delineated regions for the first 12 patients in one embodiment.

[0082] FIG. 17 presents the SPLASH study design in one embodiment.

[0083] FIG. 18 presents RCP as a Function of Radiolabeling pH.

[0084] FIG. 19 presents RCP as a Function of Sodium Ascorbate Concentration (Reaction Buffer).

[0085] FIG. 20 presents Impact of Reaction Time and Temp on RCP.

[0086] FIG. 21 presents RCP as a function of mole ratio.

[0087] FIG. 22 presents RCP as a function of elapsed time.

[0088] FIG. 23 presents RCP as a function of elapsed time.

[0089] FIG. 24 presents a RadioHPLC Chromatogram of 177Lu-PSMA I&T composition at formation / production (i.e., TO), wherein PSMA content is about 120 μg.

[0090] FIG. 25 presents RCP as a function of Reaction Buffer Age.

[0091] FIG. 26 presents organ delineation on a representative patient.

[0092] FIG. 27 presents maximum intensity projection of the Cycle 1 SPECT / CT images.

[0093] FIG. 28 presents whole Body time-activity curve expressed as fraction of injected activity for each patient imaged at cycle 1.

[0094] FIG. 29 presents kidney time-activity curve expressed as fraction of injected activity for each patient imaged at cycle 1.

[0095] FIG. 30 presents red marrow time-activity curve expressed as fraction of injected activity for each patient imaged at cycle 1.

[0096] FIG. 31 presents salivary glands time-activity curve expressed as fraction of injected activity for each patient imaged at cycle 1.

[0097] FIG. 32 presents GI tract time-activity curve expressed as fraction of injected activity for each patient imaged at cycle 10.

[0098] FIG. 33 presents liver time-activity curve expressed as fraction of injected activity for each patient imaged at cycle 1.

[0099] FIG. 34 presents spleen time-activity curve expressed as fraction of injected activity for each patient imaged at cycle 1.

[0100] FIG. 35 presents lacrimal glands time-activity curve expressed as fraction of injected activity for each patient imaged at cycle 1.

[0101] FIG. 36 presents Cycle 1 Averaged Time Activity Curves for all source organs, in semi-logarithmic scale.

[0102] FIG. 37 presents plasma time-activity curve in fraction of injected activity per Liter for patients at cycle 1 (n=27) in semi-logarithmic scale.

[0103] FIG. 38 presents plasma time-activity curve in fraction of injected activity per Liter for patients at cycle 3 (n=15).

[0104] FIG. 39 presents pH of the eight formulations prepared in this report as a function of time.

[0105] FIG. 40 presents the concentration of PSMA I&T and related substances at T0, T0+72 h, and T0+168 h (when measured) for the eight formulations prepared at various pH values.

[0106] FIG. 41A presents the HPLC-UV chromatograms for the formulation at a starting pH of 11.4 at release (T0 h). FIG. 41B presents the HPLC-UV chromatograms for the formulation at a starting pH of 11.4 at expiry (T0+72 h).

[0107] FIG. 42 presents RCP as a function of pH at T0+72 h.

[0108] FIG. 43 presents RCP as a function of time at pH T0.

[0109] FIG. 44A presents HPLC-UV chromatograms for the formulation at a starting pH of 13.1 at release (T0 h). FIG. 44B presents HPLC-UV chromatograms for the formulation at a starting pH of 13.1 at expiry (T0+72 h). FIG. 44C presents HPLC-UV chromatograms for the formulation at a starting pH of 13.1 for the formulation at a starting pH of 11.4 at expiry (T0+72 h). FIG. 44D a HPLC-Radiometric chromatogram for the formulation at a starting pH of 13.1 at expiry (T0+72 h).

[0110] FIG. 45A presents an HPLC-UV chromatogram at T0+168 h for the two formulations at a starting pH value of 3.6. FIG. 45B presents an HPLC-UV chromatogram at T0+168 h for the two formulations at a starting pH value of 4.1. FIG. 45C presents an HPLC-UV chromatogram at T0+168 h for the two formulations at a starting pH value of 4.5. FIG. 45D presents an HPLC-UV chromatogram at T0+168 h for the two formulations at a starting pH value of 4.9.

[0111] FIG. 46 presents effect of mole ratio on RCP.

[0112] FIG. 47 presents RCP of the four formulations prepared in this report plotted against the target DTPA concentration.

[0113] FIG. 48A presents DTPA content for the formulations prepared in this report at release (TO) and expiry (T0+72 h). FIG. 48B presents the percent free [177Lu]Lu3+ for the formulations prepared in this report at release (TO) and expiry (T0+72 h). The dashed line at the top of the graph in FIG. 48B denotes the 1% limit specification on the presence of free [177Lu]Lu3+.

[0114] FIG. 49A presents an HPLC-UV chromatogram at T0+72 h for formulations at target DTPA concentrations of 0 ppm. FIG. 49B presents an HPLC-UV chromatogram at T0+72 h for formulations at target DTPA concentrations of 10 ppm. FIG. 49C presents an HPLC-UV chromatogram at T0+72 h for formulations at target DTPA concentrations of 75 ppm. FIG. 49D presents an HPLC-UV chromatogram at T0+72 h for formulations at target DTPA concentrations of 150 ppm. Relative peak areas are calculated by dividing the area of the specified impurity peak by the total sum of the area for all integrated peaks.

[0115] FIG. 50 presents HPLC-UV chromatograms at release (TO h) for the formulation at a target DTPA concentrations of 150 ppm.

[0116] FIG. 51 shows the radiochemical purity at different mole ratios, as per an embodiment of the invention.DETAILED DESCRIPTION

[0117] It will be appreciated that for simplicity and clarity of illustration, where appropriate, reference numerals have been repeated among the different figures to indicate corresponding or analogous elements. In addition, numerous specific details are set forth in order to provide a thorough understanding of the examples described herein. However, it will be understood by those of ordinary skill in the art that the examples described herein can be practiced without these specific details. In other instances, methods, procedures and components have not been described in detail so as not to obscure the related relevant feature being described. Also, the description is not to be considered as limiting the scope of the embodiments described herein. The drawings are not necessarily to scale and the proportions of certain parts may be exaggerated to better illustrate details and features of the present disclosure.

[0118] Disclosed herein is a small molecular inhibitor of PSMA that has the desirable attributes of large monoclonal antibodies with reduced negative aspects, e.g., poor permeability and toxicity. The radiopharmaceutical composition disclosed herein comprises 177Lu-PSMA I&T. 177Lu-PSMA I&T is a short-lived radiolabeled substance from which the product is formulated immediately after finished synthesis.

[0119] Headings included herein are simply for ease of reference and are not intended to limit the disclosure in any way.

[0120] Additional features and advantages of the disclosure will be set forth in the description which follows, and in part will be obvious from the description, or can be learned by practice of the herein disclosed principles. The features and advantages of the disclosure can be realized and obtained by means of the instruments and combinations particularly pointed out in the appended claims. These and other features of the disclosure will become more fully apparent from the following description and appended claims or can be learned by the practice of the principles set forth herein. All publications, patents and patent applications cited herein, whether supra or infra, are hereby incorporated by reference in their entirety.I. Definitions

[0121] Several definitions that apply throughout the above disclosure will now be presented. As used herein, the terms “comprising,”“having,” and “including” are used interchangeably in their open, non-limiting sense. The terms “a,”“an,” and “the” are understood to encompass the plural as well as the singular. Thus, the term “a mixture thereof” also relates to “mixtures thereof.”

[0122] Generally, the ranges provided are meant to include every specific range within, and combination of sub ranges between, the given ranges. Thus, a range from 1-5, includes specifically 1, 2, 3, 4 and 5, as well as sub ranges such as 2-5, 3-5, 2-3, 2-4, 1-4, etc. All ranges and values disclosed herein are inclusive and combinable. For examples, any value or point described herein that falls within a range described herein can serve as a minimum or maximum value to derive a sub-range, etc.

[0123] As used herein, “about” refers to numeric values, including whole numbers, fractions, per-centages, etc., whether or not explicitly indicated. The term “about” generally refers to a range of numerical values, for instance, ±0.5-1%, ±1-5% or ±5-10% of the recited value, that one would consider equivalent to the recited value, for example, having the same function or result.

[0124] As used herein, “PSMA” refers to prostate-specific membrane antigen, also known as folate hydrolase I or glutamate carboxypeptidase II, is a type II transmembrane protein, which is anchored in the cell membrane of prostate epithelial cells. PSMA is highly expressed on prostate epithelial cells and strongly up-regulated in prostate cancer. The PSMA expression levels are directly correlated to androgen independence, metastasis, and prostate cancer progression. Thus, PSMA is a promising molecular target for diagnosis and therapy of metastatic prostate cancer at present.

[0125] As used herein, “Lutetium-177” and “177Lu” are used interchangeably. 177Lu is a β- and γ-emitting radionuclide with a physical half-life of 6.7 days. It has a maximum and mean β-particle energy of 0.498 MeV and 0.133 MeV, respectively. The maximum and mean soft-tissue penetration depth of 177Lu is 1.7 mm and 0.23 mm, respectively. It has two main gamma emission lines: 113 keV (6% relative abundance) and 208 keV (11% relative abundance).

[0126] As used herein, “177Lu-PSMA-617,” refers to a DOTA derivative of the Glu-urea-Lys motif that has been developed in the German Cancer Research Center (DKFZ) Heidelberg, Germany, for the treatment of patients with metastatic prostate cancer.

[0127] As used herein, “[177Lu]Lu-PSMA I&T” and “177Lu-PSMA I&T” are interchangeably used and refer to 177Lu-PSMA for imaging and therapy (I&T), a third-generation derivative of 177Lu-PSMA-compounds which has been used here. The chemical name of 177Lu-PSMA I&T is (3S,7S,26R,29R,32R,37R)-29-benzyl-32-(4-hydroxy-3-iodobenzyl)-5,13,20,28,31,34-hexaoxo-37-(4,7,10-tris(carboxymethyl)-1,4,7,10-tetraazacyclododecan-1-yl)-4,6,12,21,27,30,33-heptaazaheptatriacontane-1,3,7,26,37-pentacarboxylic acid; lutetium-177 (III). The chemical structure of 177Lu-PSMA I&T is provided in FIG. 1B.

[0128] The term “half-life” as used herein refers to the biological half-life, for example, the time required for a drug's blood or plasma concentration to decrease by one half. This decrease in drug concentration is a reflection of its excretion or elimination after absorption is complete and distribution has reached an equilibrium or quasi equilibrium state. The half-life of a drug in the blood may be determined graphically off of a pharmacokinetic plot of a drug's blood-concentration time plot, typically after intravenous administration to a sample population. The half-life can also be determined using mathematical calculations that are well known in the art. Further, as used herein the term “half-life” also includes the “apparent half-life” of a drug. The apparent half-life may be a composite number that accounts for contributions from other processes besides elimination, such as absorption, reuptake, or enterohepatic recycling.

[0129] As used herein, “PRLT” refers to prostate radioligand therapy and “RLT” refers to radioligand therapy. PRLT in this context involves the systemic intravenous administration of a specific radiopharmaceutical composed of a β-emitting radionuclide chelated to a small molecule for the purpose of delivering cytotoxic radiation to cancer cells. All compositions and methods described herein may be used for PRLT and / or treating cancer.

[0130] The term “CRPC,” as used herein, refers to castrate resistant prostate cancer. In an example, a patient with CRPC may have castrate serum testosterone<50 μg / l or 1.7 nmol / l plus one of the following types of progression: biochemical progression or radiologic progression, as defined below. All compositions and methods described herein may be used for CRPC and / or treating cancer.

[0131] The term “biochemical progression,” as used herein, refers to three consecutive rises in PSA one week apart, resulting in two 50% increases over the nadir, and PSA>2 μg / l.

[0132] The term “RAC” as used herein, refers to radioactivity concentration.

[0133] The term “radiologic progression,” as used herein, refers to the appearance of new lesions; either two or more new bone lesions on bone scan or a soft tissue lesion using the Response Evaluation Criteria in Solid Tumors (RECIST).

[0134] As used herein, the terms “end of synthesis,”“after formulation,” and “end of formulation” are used interchangeably to mean when the process of preparing the composition has completed. This may also include the time after quality control and release of the drug product by a Qualified Person.

[0135] The term “active agent” or “drug,” as used herein, refers to any chemical that elicits a biochemical response when administered to a human or an animal. The drug may act as a substrate or product of a biochemical reaction, or the drug may interact with a cell receptor and elicit a physiological response, or the drug may bind with and block a receptor from eliciting a physiological response.

[0136] The term “adverse event” (AE) is any untoward medical occurrence in a subject administered an investigational drug, which does not necessarily have a causal relationship with the treatment. An AE can be any unfavorable or unintended sign (e.g., an abnormal laboratory finding), symptom, or disease temporally associated with the use of a drug, whether or not it is considered to be drug related. This includes any newly occurring event or previous condition that has increased in severity or frequency since the administration of the drug.

[0137] The terms “subject” or “patient” are used interchangeably herein and refer to a vertebrate, preferably a mammal. Mammals include, but are not limited to, humans.

[0138] As used herein, “composition” refers to radiopharmaceutical composition and vice-versa. Accordingly, “composition” and “radiopharmaceutical composition” can be used interchangeably.

[0139] The term “effective amount” or “effective dose” refers to the amount of a therapy (e.g., radiation provided herein, or another active agent described herein such as an anti-cancer treatment described herein) which is sufficient to accomplish a stated purpose or otherwise achieve the effect for which it is administered. An effective dose can be sufficient to reduce and / or ameliorate the progression, development, recurrence, severity and / or duration of a given disease, disorder or condition and / or a symptom related thereto. An effective dose can be a “therapeutically effective dose” which refers to an amount sufficient to provide a therapeutic benefit such as, for example, the reduction or amelioration of the advancement or progression of a given disease, disorder or condition, reduction or amelioration of the recurrence, development or onset of a given disease, disorder or condition, and / or to improve or enhance the prophylactic or therapeutic effect(s) of another therapy. A therapeutically effective amount of a composition described herein can also enhance the therapeutic efficacy of another therapeutic agent.

[0140] The terms “therapies,”“therapy” and / or “treatment” refer to any protocol(s), method(s), and / or agent(s) that can be used in the prevention, treatment, management, and / or amelioration of a disease, disorder, or condition or one or more symptoms thereof. In certain instances the term refers to radioligand therapy (RLT) described herein. The terms “therapy” can refer to anti-viral therapy, anti-bacterial therapy, anti-fungal therapy, anti-cancer therapy, biological therapy, supportive therapy, and / or other therapies useful in treatment, management, prevention, or amelioration of a disease, disorder, or condition or one or more symptoms thereof known to one skilled in the art, for example, a medical professional such as a physician.

[0141] The term “cancer” refers to any physiological condition in mammals characterized by unregulated cell growth. Cancers described herein include solid tumors and hematological (blood) cancers, including but not limited to mCRPC. A “hematological cancer” refers to any blood home cancer and includes, for example, myelomas, lymphomas and leukemias. A “solid tumor” or “tumor” refers to a lesion and neoplastic cell growth and proliferation, whether malignant or benign, and all pre-cancerous and cancerous cells and tissues resulting in abnormal tissue growth. “Neoplastic,” as used herein, refers to any form of dysregulated or unregulated cell growth, whether malignant or benign, resulting in abnormal tissue growth.

[0142] The terms “treating” or “treatment” refer to any indicia of success or amelioration of the progression, severity, and / or duration of a disease, pathology or condition, including any objective or subjective parameter such as abatement; remission; diminishing of symptoms or making the injury, pathology or condition more tolerable to the patient; slowing in the rate of degeneration or decline; making the final point of degeneration less debilitating; or improving a patient's physical or mental well-being. In the context of treating a cancer or tumor, treating may comprise slowing growth of a tumor, ceasing growth of a tumor, shrinking or decreasing the size of a tumor, preventing a change in shape or morphology of a tumor, preventing the spread of a tumor (e.g., preventing metastases), increasing survivability, and / or decreasing mortality.

[0143] The term “enhance” refers to an increase or improvement in the function or activity of a protein or cell or improve the overall wellbeing of a patient after administration of the “treatment” or “therapy” described herein compared to the protein or cell prior to such administration or contact.

[0144] The term “administering” refers to the act of delivering a pharmaceutical composition or a radiopharmaceutical composition described herein into a subject by parenteral routes including intravenous, intramuscular, intra-arterial, intradermal, subcutaneous, intraperitoneal, intraventricular, and intracranial administration. Administration generally occurs after the onset of the disease, disorder, or condition, or its symptoms but, in certain instances, can occur before the onset of the disease, disorder, or condition, or its symptoms (e.g., administration for patients prone to such a disease, disorder, or condition). For the intravenous route of administration as used herein, the term “injection” and “intravenous infusion” can be used interchangeably.II. Introduction

[0145] The present disclosure is directed to a radiopharmaceutical composition comprising 177Lu-PSMA I&T. In some embodiments, the composition may be formulated as a radiopharmaceutical solution for injection or intravenous infusion. The present disclosure further relates to a high-energy, high purity, and / or low toxicity radiopharmaceutical composition comprising 177Lu-PSMA I&T that performs as an anti-tumor agent for targeted radionuclide therapy.

[0146] The present disclosure is also directed to methods of making the radiopharmaceutical composition. Provided herein are methods of increasing the shelf life of a radiopharmaceutical product.

[0147] The present disclosure further relates to the properties of the radiopharmaceutical composition and methods of use of the radiopharmaceutical composition.

[0148] 177Lu-PSMA I&T is also known by its synonyms as follows: [177Lu]Lutetium-PSMA I&T, 177Lu-ITG-PSMA-1, PSMA-TUM3, 177Lu-DOTAGA-(I-y)fk(Sub-KuE) or 177Lu-(3S,7S)-29-benzyl-32 (3-iodo, 4-hydroxy)-benzyl-5, 12, 20, 28, 31, 34-hexaoxo-37-(4,7,10-tris(carboxymethyl)-1, 4, 7, 10-tetraazacyclododecan-1-yl)-4, 6, 12, 21, 27, 30, 33-heptaazaheptatriacontane-1, 3, 7, 26, 37-pentacarboxylic acid. The molecular formula of the unlabeled precursor is C63H92IN11O23·4TFA·3H2O with a relative molecular mass of 1498 g / mol.

[0149] The labelled substance 177Lu-PSMA I&T may be labelled with non-carrier-added Lutetium-177 (T1 / 2=6.6 d) solution. 177Lu-PSMA I&T is a short-lived radiolabeled substance from which the product is formulated immediately after finished synthesis. Therefore, there are no specifications or batch analysis results for the labelled substance. Controls are performed on the labelled drug product.

[0150] The synthesized 177Lu-PSMA I&T solution may be formulated in an injections grade water solution containing stabilizing agents such as ascorbic acid. The solution may be sterilized by aseptic filtration through a 0.22 μm filter prior to dispensing into vials. Administration of the formulated solution may be within 72 h of the end of the synthesis after quality control and release of the drug product. Administration of the formulated solution may be via injection or intravenous infusion to a human patient in need thereof within 72 h of the end of the synthesis after quality control and release of the drug product.

[0151] Ascorbic acid may be employed to minimize radiolysis of radiolabeled preparations. In addition to ascorbic acid, maintaining the pH of the drug product at or below 5 may stabilize the labelled product against radiolytic decomposition and enhancing its shelf life. Thus, in another aspect, the present disclosure further provides a dose formulation containing ascorbic acid at pH of 5 or below that improves stability of the radiopharmaceutical composition against radiolytic decomposition, thus improving the shelf life of the composition.

[0152] The stability enhancing conditions may be applied as early as possible in the manufacturing process. For example, ascorbic acid solutions at pH 5 or below (e.g., pH of 5.0, 4.9, 4.8, 4.7, 4.6, 4.5, 4.4, 4.3, 4.2, 4.1, 4.0, 3.9, 3.8, 3.7, 3.6, 3.5, 3.3, 3.2, 3.1, or 3.0) may be used instead of water in the purification steps of the labelled 177Lu-PSMA I&T to minimize radiolytic damage.

[0153] The composition, when administered to a subject, may result in low hematotoxicity and nephrotoxicity profiles, providing better effects and fewer adverse effects than monoclonal antibody treatments and other comparable third-line treatments.

[0154] The composition is an improved composition in that it has a shelf life of 72 hours or more after formulation. Additionally, the improved composition has a radiochemical purity of greater than 95% at administration. That is, the improved formulation maintains a high level of radiochemical purity for 72 hours or more after formulation. Therefore, the improved formulation is suitable for administration up to 24, up to 72 hours, or longer than other compositions comprising 177Lu-PSMA I&T.III. Compositions

[0155] Disclosed herein inter alia is a composition that includes 177Lu, PSMA I&T and one or more optional agents including buffering agents and / or solvents. In one embodiment, the composition is suitable for administration to a human patient in need thereof.

[0156] In one embodiment, the composition has a radiochemical purity (RCP) of 95% or greater at administration. In another embodiment, the composition has a radiochemical purity (RCP) of 97% or greater at administration. In another embodiment, the composition has a radiochemical purity (RCP) of 97.5% or greater at administration. In another embodiment, the composition has a radiochemical purity (RCP) of 98.0% or greater, 98.5% or greater, 99.0% or greater, or 99.5% or greater at administration.

[0157] In one embodiment, the composition has a radiochemical purity (RCP) of 95% or greater at 72 hours after production. In another embodiment, the composition has a radiochemical purity (RCP) of 97% or greater at 72 hours after production. In another embodiment, the composition has a radiochemical purity (RCP) of 97.5% or greater at 72 hours after production. In another embodiment, the composition has a radiochemical purity (RCP) of 98.0% or greater, 98.5% or greater, 99.0% or greater, or 99.5% or greater at 72 hours after production. In another embodiment, the composition has a radiochemical purity (RCP) of 90% or greater, 91% or greater, 92% or greater, 93% or greater, 94% or greater, 95% or greater at 7 days after production.

[0158] In one embodiment, the composition has a radiochemical purity (RCP) of 96.0% or greater, 96.5% or greater, 97.0% or greater, 97.5% or greater, 98.0% or greater, 98.5% or greater, 99.0% or greater, or 99.5% or greater at 7 days after production.

[0159] In one embodiment, the composition is produced as part of a 4 Ci to 10 Ci batch scale. In another embodiment, the composition is produced as part of a 4 Ci to 15 Ci batch scale.

[0160] Further disclosed herein is a radiopharmaceutical composition or formulation that includes a dose of 177Lu-PSMA I&T and at least one of a stabilizing agent, an antioxidant, a pH adjuster, a metal ion chelator, water, or a combination thereof.

[0161] In one specific embodiment, the stabilizing agent is ascorbic acid. In another embodiment the antioxidant may be ethanol, ascorbic acid, gentisic acid, or a combination thereof. In another embodiment, the pH adjuster includes but is not limited to sodium hydroxide, sodium bicarbonate, hydrochloric acid, or combinations thereof. In yet another embodiment, the chelator may be EDTA or DTPA. In another specific embodiment, the stabilizing agent comprises no ethanol (i.e., 0% ethanol, less than 0.5% ethanol, or less than 1.0% ethanol (w / w) in the composition).

[0162] In one embodiment, the medicinal product or radiopharmaceutical composition (or formulation) may be a sterile filtered radiopharmaceutical solution containing a dose of 177Lu-PSMA I&T in an aqueous ascorbic acid solution containing ethanol. For example, the total amount of ascorbic acid in the solution may be about 25 to about 65 mg / mL and the total amount of ethanol in the solution may be about 3.8% (v / v) to about 7.5% (v / v). In some embodiments, the total amount of ascorbic acid in the solution is from about 21 mg / mL to about 42.5 mg / mL. The 177Lu-PSMA I&T is present in sufficient amounts of radioactivity for intended use. Experiments performed with various dose formulations suggests that 177Lu-PSMA I&T formulation composition containing about 31 mg / ml of ascorbic acid at pH of about 4.5 and radioactivity concentration of about 640 MBq / ml or below may provide adequate radiochemical stability of four days. The adequate radiochemical stability referred herein is radiopharmaceutical composition where the radiochemical purity of the 177Lu-PSMA I&T is at least 95%, 95.5% or greater, 96.5% or greater, 97.0% or greater, 97.5% or greater, 98.0% or greater, 98.5% or greater, 99.0% or greater, or 99.5% or greater at administration.

[0163] In one embodiment, the radiopharmaceutical composition is a sterile filtered radiopharmaceutical solution containing a small amount of 177Lu-PSMA I&T in an aqueous ascorbic acid and ethanol solution. In another embodiment, the radiopharmaceutical composition is a sterile filtered radiopharmaceutical solution containing a small amount of 177Lu-PSMA I&T in an aqueous ascorbic acid without ethanol solution. For example, the radiopharmaceutical composition may be a sterile filtered radiopharmaceutical solution containing a micro dose of 177Lu-PSMA I&T in an aqueous ascorbic acid and DTPA or EDTA (e.g., comprising ethanol or in the complete absence of ethanol). The product is diluted to a standard radioactivity concentration and therefore the final volume of the bulk product varies depending on the starting radioactivity of 177Lu introduced.

[0164] One aspect of the disclosure provides for a radiopharmaceutical composition with a pH from about 3 to about 9, from about 4 to about 9, from about 5 to about 9, from about 3 to about 8, from about 4 to about 8, from about 3 to about 5, or from about 5 to about 8. The pH of the radiopharmaceutical composition may be about 3.0, about 3.1, about 3.2, about 3.3, about 3.4, about 3.5, about 3.6, about 3.7, about 3.8, about 3.9, about 4, about 4.1, about 4.2, about 4.3, about 4.4, about 4.5, about 4.6, about 4.7, about 4.8, about 4.9, about 5.0, about 5.1, about 5.2, about 5.3, about 5.4, about 5.5, about 5.6, about 5.7, about 5.8, about 5.9, about 6.0, about 6.1, about 6.2, about 6.3, about 6.4, about 6.5, about 6.6, about 6.7, about 6.8, about 6.9, about 7.0, about 7.1, about 7.2, about 7.3, about 7.4, about 7.5, about 7.6, about 7.7, about 7.8, about 7.9, about 8.0, about 8.1, about 8.2, about 8.3, about 8.4, about 8.5, or about 9.

[0165] Having a pH of 5 or below may stabilize the radiopharmaceutical composition against radiolytic decomposition and may enhance its shelf life.

[0166] In one embodiment, the pH of the radiopharmaceutical composition is from about 3 to about 5. This pH range may stabilize the radiopharmaceutical composition against radiolytic decomposition and may enhance its shelf life. In yet another embodiment, a radiopharmaceutical composition comprising ascorbic acid and having a pH from about 3.5 to about 5 has improved stability and extended shelf life compared to known radiopharmaceutical compositions of 177Lu-PSMA I&T which have higher pH values and may comprise gentisic acid. In other embodiments, the radiopharmaceutical composition may comprise an absence of gentisic acid (i.e., no gentisic acid).). In yet another embodiment, a radiopharmaceutical composition comprising ascorbic acid and having a pH from about 4.0 to about 4.5 has improved stability and extended shelf life

[0167] The pH of the radiopharmaceutical composition may range from 3.0 to 5.0, 3.0 to 3.5, 3.0 to 3.05, 3.05 to 3.1, 3.0 to 3.1, 3.1 to 3.15, 3.1 to 3.2, 3.15 to 3.2, 3.2 to 3.25, 3.0 to 3.25, 3.2 to 3.3, 3.25 to 3.3, 3.3 to 3.35, 3.3 to 3.4, 3.35 to 3.4, 3.4 to 3.45, 3.4 to 3.5, 3.45 to 3.5, 3.25 to 3.5, 3.5 to 3.55, 3.5 to 3.6, 3.55 to 3.6, 3.6 to 3.65, 3.6 to 3.7, 3.65 to 3.7, 3.7 to 3.75, 3.5 to 3.75, 3.7 to 3.8, 3.75 to 3.8, 3.8 to 3.85, 3.8 to 3.9, 3.85 to 3.9, 3.9 to 3.95, 3.9 to 4.0, 3.95 to 4.0, 3.5 to 4.0, 3.75 to 4.0, 4.0 to 4.05, 4.0 to 4.1, 4.05 to 4.1, 4.1 to 4.15, 4.1 to 4.2, 4.15 to 4.2, 3.5 to 4.2, 4.2 to 4.25, 4.0 to 4.25, 4.2 to 4.3, 4.25 to 4.3, 4.3 to 4.35, 4.3 to 4.4, 4.35 to 4.4, 4.4 to 4.45, 4.4 to 4.5, 4.45 to 4.5, 4.25 to 4.5, 4.0 to 4.5, 4.5 to 4.55, 4.5 to 4.6, 4.55 to 4.6, 4.6 to 4.65, 4.6 to 4.7, 4.65 to 4.7, 4.7 to 4.75, 4.7 to 4.8, 4.75 to 4.8, 4.8 to 4.85, 4.8 to 4.9, 4.85 to 4.9, 4.9 to 4.95, 4.9 to 5.0, 4.95 to 5.0, 4.5 to 5.0, or 4.75 to 5.0. In some examples, the pH of the radiopharmaceutical composition may be adjusted to a final pH of 3.0, 3.5, 4.0, 4.5, or 5.0. In some embodiments, including the above listed pH numbers and ranges, the pH values are inclusive of ±0.05, ±0.10, ±0.15, ±0.20, or ±0.25.

[0168] In another embodiment, the radiopharmaceutical composition or formulation has a purity of at least about 90%, at least about 95%, at least about 97%, or at least about 99%. In another embodiment, the radiopharmaceutical composition or formulation has a purity of about 90%, about 91%, about 92%, about 93%, about 94%, about 95%, about 96%, about 97%, about 98%, about 99%, or about 99.5%.

[0169] In another embodiment, radiopharmaceutical composition or formulation has a purity of at least about 90%, at least about 95%, at least about 97%, or at least about 99% as measured by HPLC, TLC, or liquid chromatography. In another embodiment, the radiopharmaceutical composition or formulation has a purity of at least about 90.0%, at least about 91.0%, at least about 92.0%, at least about 93.0%, at least about 94.0%, at least about 95.0%, at least about 96.0%, at least about 97.0%, at least about 98.0%, at least about 99.0%, or at least about 99.5% as measured by HPLC or TLC. In some examples, the radiopharmaceutical composition may have a radiochemical purity of 95.0% or greater, 95.5% or greater, 96.0% or greater, 96.5% or greater, 97.0% or greater, 97.5% or greater, 98.0% or greater, 98.5% or greater, 99.0% or greater, or 99.5% or greater at administration. FIG. 5 shows the radiochemical purity of formulations prepared at different pH values.

[0170] In another embodiment, the purity of the radiopharmaceutical composition or formulation is measured by HPLC or TLC, at any time post end of synthesis (EOS). In one embodiment, the purity of the radiopharmaceutical composition or formulation is measured by HPLC or TLC, at about 0 hour, about 10 hours, about 20 hours, about 30 hours, about 40 hours, about 50 hours, about 50 hours, about 60 hours, about 70 hours, about 80 hours, about 90 hours, about 100 hours, about 120 hours, and about 168 hours post EOS.

[0171] In one specific embodiment, the radiopharmaceutical composition or formulation has a purity of at least about 99% as measured by HPLC or TLC 0 hours post EOS. In another specific embodiment, the radiopharmaceutical composition or formulation has a purity of at least about 96.5% as measured by HPLC or TLC 24 hours post EOS, at least about 93% as measured by HPLC, or TLC 46 hours post EOS, at least about 95% as measured by HPLC or TLC 67 hours post EOS, at least about 96% as measured by HPLC or TLC 92 hours post EOS.

[0172] In another embodiment, the radioactivity is measured in a dose calibrator. The radioactive amount of 177Lu-PSMA I&T is determined when the dose is dispensed prior to patient administration.

[0173] In yet another embodiment, the radiochemical purity of 177Lu-PSMA I&T is determined by liquid chromatography with radioactivity detection and thin layer chromatography.

[0174] In one embodiment, bacterial endotoxin content is determined for each batch before release using a PTS-tester (Ph Eur method D or USP<85>) and sterility is determined according to Ph Eur and USP<71>.

[0175] In one embodiment, the radiopharmaceutical composition or formulation is stored at a temperature from about +5° C. to +55° C., +5° C. to +40° C., about +10° C. to +35° C. or about +20° C. to +30° C. In one specific embodiment, the radiopharmaceutical composition or formulation is stored at a temperature at about +10° C., about +15° C., about +22° C., about +22.5° C., about +25° C., or at room temperature.

[0176] Another aspect of the disclosure provides for a radioactive content of about 70% to 130%. The radioactive content of the radiopharmaceutical composition may be about 90% to 125%, 90% to 120%, 90% to 115%, or 90% to 110%.

[0177] In one specific embodiment, the radioactive content of the formulation is about 70%, about 75%, about 80%, about 85%, about 90%, about 95%, about 100%, about 105%, about 110%, about 115%, about 120%, about 125%, or about 130%.

[0178] Another aspect of the disclosure provides for a radiopharmaceutical composition with a mean whole-body effective dose of about 23±20 Gy (3.3 Gy / GBq), with a mean absorbed organ doses of about 26±20 Gy (3.4 Gy / GBq), 24±16 Gy (3.2 Gy / GBq), 8.5±4.7 Gy (1.28 Gy / GBq), and 13±7.4 Gy (1.7 Gy / GBq) for the bone, lymph node, liver, and lung metastases, respectively.

[0179] In some embodiments, the radiopharmaceutical composition may have a low radioactivity concentration (“low RAC”) of about 563 MBq / ml to about 734 MBq / ml. For example, the radiopharmaceutical composition may have a low radioactivity that may be about 11,580 MBq (313 mCi), about 11,770 MBq (318 mCi), or about 12,520 MBq (338 mCi) in a 20 ml volume of the solution. In other embodiments the radiopharmaceutical composition may have a low radioactivity concentration of at least about 550 MBq / ml, at least about 560 MBq / ml, at least about 570 MBq / ml, at least about 580 MBq / ml, at least about 590 MBq / ml, at least about 600 MBq / ml, at least about 610 MBq / ml, at least about 620 MBq / ml, at least about 630 MBq / ml, at least about 640 MBq / ml, at least about 650 MBq / ml, at least about 660 MBq / mL, at least about 670 MBq / mL, at least about 680 MBq / mL, at least about 690 MBq / mL, at least about 700 MBq / mL, at least about 710 MBq / mL, at least about 720 MBq / mL, at least about 730 MBq / mL, at least about 740 MBq / mL, or at least about 750 MBq / mL. In still other embodiments the radiopharmaceutical composition may have a low radioactivity concentration from about 550 MBq / ml to about 575 MBq / ml, from about 575 MBq / ml to about 600 MBq / ml, from about 600 MBq / ml to about 625 MBq / ml, from about 625 MBq / ml to about 650 MBq / ml, from about 650 MBq / ml to about 675 MBq / ml, from about 675 MBq / ml to about 700 MBq / ml, from about 700 MBq / ml to about 725 MBq / ml, from about 725 MBq / ml to about 750 MBq / ml or from about 625 MBq / ml to about 650.

[0180] In additional embodiments, the radiopharmaceutical composition may have a high radioactivity concentration (“High RAC”) of about 1,270 MBq / ml to about 1,311 MBq / ml. For example, the radiopharmaceutical composition may have a high radioactivity that may be about 12,780 MBq (345 mCi), about 12,810 MBq (346 mCi), or about 13,110 MBq (354 mCi) in a 10 ml volume of the solution. In other embodiments the radiopharmaceutical composition may have a high radioactivity concentration of at least about 1,100 MBq / ml, at least about 1,110 MBq / ml, at least about 1,120 MBq / ml, at least about 1,130 MBq / ml, at least about 1,140 MBq / ml, at least about 1,150 MBq / ml, at least about 1,160 MBq / ml, at least about 1,170 MBq / ml, at least about 1,180 MBq / ml, at least about 1,190 MBq / ml, at least about 1,200 MBq / ml, 1,200 MBq / ml, at least about 1,210 MBq / ml, at least about 1,220 MBq / ml, at least about 1,230 MBq / ml, at least about 1,240 MBq / ml, at least about 1,250 MBq / ml, at least about 1,260 MBq / ml, at least about 1,270 MBq / ml, at least about 1,280 MBq / ml, at least about 1,290 MBq / ml, at least about 1,300 MBq / ml, at least about 1,310 MBq / ml, at least about 1,320 MBq / ml, at least about 1,330 MBq / ml, at least about 1,340 MBq / ml, or at least about 1,350 MBq / ml. In still other embodiments the radiopharmaceutical composition may have a high radioactivity concentration from about 1,000 MBq / ml to about 1,400 MBq / ml, from about 1,050 MBq / ml to about 1,350 MBq / ml, from about 1,100 MBq / ml to about 1,300 MBq / ml, from about 1,150 MBq / ml to about 1,250 MBq / ml, from about 1,200 MBq / ml to about 1,300 MBq / ml, from about 1,250 MBq / ml to about 1,350 MBq / ml, or from about 1,250 MBq / ml to about 1,300 MBq / ml.(i) 177Lu-PSMA I&T

[0181] The total amount of 177Lu-PSMA I&T present in the radiopharmaceutical composition can and will vary. FIGS. 1A and 1B show the chemical structure of precursor PSMA I&T and 177Lu-PSMA I&T respectively.

[0182] In one embodiment, the mass of radioactive pharmaceutical ingredient (177Lu-PSMA I&T) in the drug product is less than about 40 μg, less than about 35 μg, less than about 30 μg, less than about 25 μg, less than about 20 μg, less than about 15 μg, or less than about 10 μg per vial. In yet another embodiment, the mass of radioactive pharmaceutical ingredient (177Lu-PSMA I&T) in the drug product is about 1 μg, about 2 μg, about 3 μg, about 4 μg, about 5 μg, about 6 μg, about 7 μg, about 8 μg, about 9 μg, or about 10 μg, about 11 μg, about 12 μg about, about 13 μg, about 14 μg, about 15 μg, about 16 μg, about 17 μg, about 18 μg, about 17.2 μg, about 18 μgm about 19 μg, about 20 μg, about 21 μg, about 22 μg, about 23 μg, about 24 μg, about 25 μg, about 26 μg, about 27 μg, about 28 μg, about 29 μg, about 30 μg, about 31 μg, about 32 μg, about 33 μg, about 34 μg, about 35 μg, about 36 μg, about 37 μg, about 38 μg, about 39 μg, or about 40 μg of 177Lu-PSMA I&T per vial.

[0183] In one embodiment, the total amount of 177Lu-PSMA I&T present in the pharmaceutical composition can and will vary. In the labeling process, the PSMA I&T ligand may be labeled with trace metals that are present to form a chelated trace metal-PSMA I&T complex (i.e., “M-PSMA I&T”). Excess PSMA I&T present in the labeling process may remain unlabeled with either 177Lu or trace metals. The amount of M-PSMA I&T and unlabeled PSMA I&T in the composition is hereinafter referred to as “related substances” or “RS”. The composition may then contain both 177Lu-PSMA I&T, M-PSMA I&T as well as unlabeled PSMA I&T. In an embodiment, the PSMA content comprising PSMA I&T and related substances (RS) is 250 μg / dose±15%, ±10%, or ±5%. In another embodiment, the PSMA I&T content is 120 μg / dose±15%, ±10%, or ±5% to about 250 μg / dose±15%, ±10%, or ±5%. In another embodiment, the PSMA I&T content is about 100 μg / dose±15%, ±10%, or ±5% to about 120 μg / dose±15%, ±10%, or ±5%. In another embodiment, the PSMA I&T content is 120 μg / dose±15%, ±10%, or ±5% to about 200 μg / dose±15%, ±10%, or ±5%. In yet another embodiment, the PSMA I&T content is about 40 μg / dose±15%, ±10%, or ±5% to about 100 μg / dose±15%, ±10%, or ±5%, 50 μg / dose±15%, ±10%, or ±5% to about 100 μg / dose±15%, ±10%, or ±5%, 60 μg / dose±15%, ±10%, or ±5% to about 100 μg / dose±15%, ±10%, or ±5%, or 70 μg / dose±15%, ±10%, or ±5% to about 100 μg / dose±15%, ±10%, or ±5%. In yet another embodiment, the PSMA I&T content is about 40 μg / dose±15%, ±10%, or ±5% to about 90 μg / dose±15%, ±10%, or ±5%, 50 μg / dose±15%, ±10%, or ±5% to about 90 μg / dose±15%, ±10%, or ±5%, 60 μg / dose±15%, ±10%, or ±5% to about 90 μg / dose±15%, ±10%, or ±5%, or 70 μg / dose±15%, ±10%, or ±5% to about 90 μg / dose±15%, ±10%, or ±5%. In yet another embodiment, the PSMA I&T content is about 40 μg / dose±15%, ±10%, or ±5% to about 80 μg / dose±15%, ±10%, or ±5%, 50 μg / dose±15%, ±10%, or ±5% to about 80 μg / dose±15%, ±10%, or ±5%, 60 μg / dose±15%, ±10%, or ±5% to about 80 μg / dose±15%, ±10%, or ±5%, or 70 μg / dose±15%, ±10%, or ±5% to about 80 μg / dose±15%, ±10%, or ±5%.

[0184] In another embodiment, the compositions comprising 177Lu-PSMA I&T described herein may comprise a PSMA I&T content that is about 120 μg / dose to about 250 μg / dose, about 130 μg / dose to about 250 μg / dose, about 140 μg / dose to about 250 μg / dose, about 150 μg / dose to about 250 μg / dose, about 160 μg / dose to about 250 μg / dose, about 170 μg / dose to about 250 μg / dose, about 180 μg / dose to about 250 μg / dose, about 190 μg / dose to about 250 μg / dose, about 200 μg / dose to about 250 μg / dose, about 210 μg / dose to about 250 μg / dose, about 220 μg / dose to about 250 μg / dose, about 230 μg / dose to about 250 μg / dose, or about 240 μg / dose to about 250 μg / dose. In another embodiment, the compositions comprising 177Lu-PSMA I&T described herein may comprise a PSMA I&T content that is about 100 μg / dose to about 120 μg / dose, about 105 μg / dose to about 120 μg / dose, about 110 μg / dose to about 120 μg / dose, or about 115 μg / dose to about 120 μg / dose. In another embodiment, the compositions comprising 177Lu-PSMA I&T described herein may comprise a PSMA I&T content that is about 40 μg / dose to about 100 μg / dose, about 45 μg / dose to about 100 μg / dose, about 50 μg / dose to about 100 μg / dose, about 55 μg / dose to about 100 μg / dose, about 60 μg / dose to about 100 μg / dose, about 65 μg / dose to about 100 μg / dose, about 70 μg / dose to about 100 μg / dose, about 75 μg / dose to about 100 μg / dose, about 80 μg / dose to about 100 μg / dose, about 85 μg / dose to about 100 μg / dose, about 90 μg / dose to about 100 μg / dose, or about 95 μg / dose to about 100 μg / dose. In another embodiment, the compositions comprising 177Lu-PSMA I&T described herein may comprise a PSMA I&T content that is about 45 μg / dose to about 95 μg / dose, 50 μg / dose to about 100 μg / dose, 55 μg / dose to about 95 μg / dose, 60 μg / dose to about 95 μg / dose, 65 μg / dose to about 95 μg / dose, 70 μg / dose to about 95 μg / dose, 75 μg / dose to about 95 μg / dose, 80 μg / dose to about 95 μg / dose, 85 μg / dose to about 95 μg / dose, or about 90 μg / dose to about 95 μg / dose. In another embodiment, the compositions comprising 177Lu-PSMA I&T described herein may comprise a PSMA I&T content that is about 40 μg / dose to about 90 μg / dose, about 45 μg / dose to about 90 μg / dose, about 50 μg / dose to about 90 μg / dose, about 55 μg / dose to about 90 μg / dose, about 60 μg / dose to about 90 μg / dose, about 65 μg / dose to about 90 μg / dose, about 70 μg / dose to about 90 μg / dose, about 75 μg / dose to about 90 μg / dose, about 80 μg / dose to about 90 μg / dose, or about 85 μg / dose to about 90 μg / dose. In another embodiment, the compositions comprising 177Lu-PSMA I&T described herein may comprise a PSMA I&T content that is about 40 μg / dose to about 85 μg / dose, about 45 μg / dose to about 85 μg / dose, about 50 μg / dose to about 85 μg / dose, about 55 μg / dose to about 85 μg / dose, about 60 μg / dose to about 85 μg / dose, about 65 μg / dose to about 85 μg / dose, about 70 μg / dose to about 85 μg / dose, about 75 μg / dose to about 85 μg / dose, about 80 μg / dose to about 85 μg / dose. In another embodiment, the compositions comprising 177Lu-PSMA I&T described herein may comprise a PSMA I&T content that is about 40 μg / dose to about 80 μg / dose, about 45 μg / dose to about 80 μg / dose, about 50 μg / dose to about 80 μg / dose, about 55 μg / dose to about 80 μg / dose, about 60 μg / dose to about 80 μg / dose, about 65 μg / dose to about 80 μg / dose, about 70 μg / dose to about 80 μg / dose, or about 75 μg / dose to about 80 μg / dose. In another embodiment, the compositions comprising 177Lu-PSMA I&T described herein may comprise a PSMA I&T content that is about 40 μg / dose to about 75 μg / dose, about 45 μg / dose to about 75 μg / dose, about 50 μg / dose to about 75 μg / dose, about 55 μg / dose to about 75 μg / dose, about 60 μg / dose to about 75 μg / dose, about 65 μg / dose to about 75 μg / dose, about 70 μg / dose to about 75 μg / dose.

[0185] In one embodiment, the PSMA I&T amount present in the pharmaceutical composition is about 30 μg to 120 μg per dose, 35 μg to 120 μg per dose, 40 μg to 120 μg per dose, 45 μg to 120 μg per dose, 50 μg to 120 μg per dose, 55 μg to 120 μg per dose, 60 μg to 120 μg per dose, 65 μg to 120 μg per dose, 70 μg to 120 μg per dose, 75 μg to 120 μg per dose, 85 μg to 120 μg per dose, 90 μg to 120 μg per dose, 95 μg to 120 μg per dose, 100 μg to 120 μg per dose, 105 μg to 120 μg per dose, 110 μg to 120 μg per dose, or 115 μg to 120 μg per dose. In one embodiment, the PSMA I&T amount present in the pharmaceutical composition is about 30 μg to 100 μg per dose, 35 μg to 100 μg per dose, 40 μg to 100 μg per dose, 45 μg to 100 μg per dose, 50 μg to 100 μg per dose, 55 μg to 100 μg per dose, 60 μg to 100 μg per dose, 65 μg to 100 μg per dose, 70 μg to 100 μg per dose, 75 μg to 100 μg per dose, 85 μg to 100 μg per dose, or 90 μg to 100 μg per dose. In another embodiment, the PSMA I&T amount present in the pharmaceutical composition is about 30 μg to 90 μg per dose, 35 μg to 90 μg per dose, 40 μg to 90 μg per dose, 45 μg to 90 μg per dose, 50 μg to 90 μg per dose, 55 μg to 90 μg per dose, 60 μg to 90 μg per dose, 65 μg to 90 μg per dose, 70 μg to 90 μg per dose, 75 μg to 90 μg per dose, or 85 μg to 90 μg per dose. In another embodiment, the PSMA I&T amount present in the pharmaceutical composition is about 30 μg to 80 μg per dose, 35 μg to 80 μg per dose, 40 μg to 80 μg per dose, 45 μg to 80 μg per dose, 50 μg to 80 μg per dose, 55 μg to 80 μg per dose, 60 μg to 80 μg per dose, 65 μg to 80 μg per dose, 70 μg to 80 μg per dose, or 75 μg to 80 μg per dose. In yet another embodiment, the PSMA I&T amount present in the pharmaceutical composition is about 30 μg to 70 μg per dose, 35 μg to 70 μg per dose, 40 μg to 70 μg per dose, 45 μg to 70 μg per dose, 50 μg to 70 μg per dose, 55 μg to 70 μg per dose, 60 μg to 70 μg per dose, or 65 μg to 70 μg per dose.

[0186] In one embodiment, the PSMA I&T and related substances (RS) amount present in the pharmaceutical composition is about 30 μg to 120 μg per dose, 35 μg to 120 μg per dose, 40 μg to 120 μg per dose, 45 μg to 120 μg per dose, 50 μg to 120 μg per dose, 55 μg to 120 μg per dose, 60 μg to 120 μg per dose, 65 μg to 120 μg per dose, 70 μg to 120 μg per dose, 75 μg to 120 μg per dose, 85 μg to 120 μg per dose, 90 μg to 120 μg per dose, 95 μg to 120 μg per dose, 100 μg to 120 μg per dose, 105 μg to 120 μg per dose, 110 μg to 120 μg per dose, or 115 μg to 120 μg per dose. In one embodiment, the PSMA I&T and related substances (RS) amount present in the pharmaceutical composition is about 30 μg to 100 μg per dose, 35 μg to 100 μg per dose, 40 μg to 100 μg per dose, 45 μg to 100 μg per dose, 50 μg to 100 μg per dose, 55 μg to 100 μg per dose, 60 μg to 100 μg per dose, 65 μg to 100 μg per dose, 70 μg to 100 μg per dose, 75 μg to 100 μg per dose, 85 μg to 100 μg per dose, or 90 μg to 100 μg per dose. In another embodiment the PSMA I&T and related substances (RS) amount present in the pharmaceutical composition is about 30 μg to 90 μg per dose, 35 μg to 90 μg per dose, 40 μg to 90 μg per dose, 45 μg to 90 μg per dose, 50 μg to 90 μg per dose, 55 μg to 90 μg per dose, 60 μg to 90 μg per dose, 65 μg to 90 μg per dose, 70 μg to 90 μg per dose, 75 μg to 90 μg per dose, or 85 μg to 90 μg per dose. In another embodiment, the PSMA I&T and related substances (RS) amount present in the pharmaceutical composition is about 30 μg to 80 μg per dose, 35 μg to 80 μg per dose, 40 μg to 80 μg per dose, 45 μg to 80 μg per dose, 50 μg to 80 μg per dose, 55 μg to 80 μg per dose, 60 μg to 80 μg per dose, 65 μg to 80 μg per dose, 70 μg to 80 μg per dose, or 75 μg to 80 μg per dose. In yet another embodiment, the PSMA I&T and related substances (RS) amount present in the pharmaceutical composition is about 30 μg to 70 μg per dose, 35 μg to 70 μg per dose, 40 μg to 70 μg per dose, 45 μg to 70 μg per dose, 50 μg to 70 μg per dose, 55 μg to 70 μg per dose, 60 μg to 70 μg per dose, or 65 μg to 70 μg per dose.

[0187] In another embodiment, the PSMA I&T and related substances (RS) amount present in the pharmaceutical composition is about 55 μg to 110 μg per dose. In another embodiment, the PSMA I&T and related substances (RS) amount present in the pharmaceutical composition is about 75 μg to 100 μg per dose.

[0188] In one embodiment, the PSMA I&T and related substances (RS) amount present in the pharmaceutical composition is about 80 μg to 110 μg per dose. In another embodiment, the PSMA I&T and related substances (RS) amount present in the pharmaceutical composition is about 70 μg to 85 μg per dose. In another embodiment, the PSMA I&T and related substances (RS) amount present in the pharmaceutical composition is about 73 μg to 85 μg per dose. In another embodiment, the PSMA I&T and related substances (RS) amount present in the pharmaceutical composition is about 90 μg to 115 μg per dose. In another embodiment, the PSMA I&T and related substances (RS) amount present in the pharmaceutical composition is about 100 μg to 80 μg per dose.

[0189] In one embodiment, the PSMA I&T and related substances (RS) amount present in the pharmaceutical composition is about 110 μg to 80 μg per dose. In another embodiment, the PSMA I&T and related substances (RS) amount present in the pharmaceutical composition is about 115 μg to 125 μg per dose. In another embodiment, the PSMA I&T and related substances (RS) amount present in the pharmaceutical composition is about 115 μg to 130 μg per dose

[0190] In one embodiment, the PSMA I&T and related substances (RS) amount present in the pharmaceutical composition is about 45 μg 50 μg, 57 μg, 60μg, 70 μg, 75 μg, 80 μg, 85 μg, 99 μg, 100 μg, 115 μg, 80 μg, 125 μg, 130 μg, per vial. In another embodiment, the PSMA I&T and related substances (RS) amount present in the pharmaceutical composition is about 80 μg.

[0191] In one embodiment, the PSMA I&T and related substances (RS) amount present in the pharmaceutical composition is about 57 μg. In one embodiment, the PSMA I&T and related substances (RS) amount present in the pharmaceutical composition is about 99 μg.

[0192] In one embodiment, the total volume of the vial comprising PSMA I&T and related substances (RS) is about 5 to 30 mL. In another embodiment, the total volume of the vial comprising PSMA I&T and related substances (RS) is about 10 to 20 mL. In another embodiment, the total volume of the vial comprising PSMA I&T and related substances (RS) is about 15 to 20 mL. In another embodiment, the total volume of the vial comprising PSMA I&T and related substances (RS) is about 15 to 17 mL. In another embodiment, the total volume of the vial comprising PSMA I&T and related substances (RS) is about 15 mL.

[0193] In one embodiment, the PSMA I&T and related substances (RS) concentration per vial is 3 to 8 μg / mL. In another embodiment, the PSMA I&T and related substances (RS) concentration per vial is 4 to 7 μg / mL. In another embodiment, the PSMA I&T and related substances (RS) concentration per vial is 4.5 to 6.5 μg / mL. In another embodiment, the PSMA I&T and related substances (RS) concentration per vial is 4.8 to 6 μg / mL.

[0194] In one embodiment, the PSMA I&T and related substances (RS) concentration per vial is 4 μg / mL. In another embodiment, the PSMA I&T and related substances (RS) concentration per vial is 5 μg / mL. In another embodiment, the PSMA I&T and related substances (RS) concentration per vial is 6 μg / mL. In another embodiment, the PSMA I&T and related substances (RS) concentration per vial is 7 μg / mL. In another embodiment, the PSMA I&T and related substances (RS) concentration per vial is 8 μg / mL.

[0195] In one embodiment, the molar ratio of the PSMA I&T to 177Lu in the composition is from 0.5:1.0 to 8.0:1.0. In another embodiment, the molar ratio of the PSMA I&T to 177Lu in the composition is from 0.5:1.0 to 8.0:1.0, 1.0:1.0 to 8.0:1.0, 1.5:1.0 to 8.0:1.0, 2.0:1.0 to 8.0:1.0, 2.5:1.0 to 8.0:1.0, 3.0:1.0 to 8.0:1.0, 3.5:1.0 to 8.0:1.0, 4.0:1.0 to 8.0:1.0, 4.5:1.0 to 8.0:1.0, 5.0:1.0 to 8.0:1.0, 5.5:1.0: to 8.0:1.0, 6.0:1.0 to 8.0:1.0, 6.5:1.0 to 8.0:1.0, 7.0:1.0 to 8.0:1.0, 7.5:1.0 to 8.0:1.0, 0.5:1.0 to 7.5:1.0, 0.5:1.0 to 7.0:1.0, 0.5:1.0 to 6.5:1.0, 0.5:1.0 to 6.0:1.0, 0.5:1.0 to 5.5:1.0, 0.5:1.0 to 5.0:1.0, 0.5:1.0 to 4.5:1.0, 0.5:1.0 to 4.0:1.0, 0.5:1.0 to 3.5:1.0, 0.5:1.0 to 3.0:1.0, 0.5:1.0 to 2.5:1.0, 0.5:1.0 to 2.0:1.0, 0.5:1.0 to 1.5:1.0, 0.5:1.0 to 1.0:1.0, 1.0:1.0 to 7.5:1.0, 1.0:1.0 to 7.0:1.0, 1.0:1.0 to 6.5:1.0, 1.0:1.0 to 6.0:1.0, 1.0:1.0 to 5.5:1.0, 1.0:1.0 to 5.0:1.0, 1.0:1.0 to 4.5:1.0, 1.0:1.0 to 4.0:1.0, 1.0:1.0 to 3.5:1.0, 1.0:1.0 to 3.0:1.0, 1.0:1.0 to 2.5:1.0, 1.0:1.0 to 2.0:1.0, 1.0:1.0 to 1.5:1.0, 1.5:1.0 to 7.5:1.0, 1.5:1.0 to 7.0:1.0, 1.5:1.0 to 6.5:1.0, 1.5:1.0 to 6.0:1.0, 1.5:1.0 to 5.5:1.0, 1.5:1.0 to 5.0:1.0, 1.5:1.0 to 4.5:1.0, 1.5:1.0 to 4.0:1.0, 1.5:1.0 to 3.5:1.0, 1.5:1.0 to 3.0:1.0, 1.5:1.0 to 2.5:1.0, 1.5:1.0 to 2.0:1.0, 2.0:1.0 to 7.5:1.0, 2.0:1.0 to 7.0:1.0, 2.0:1.0 to 6.5:1.0, 2.0:1.0 to 6.0:1.0, 2.0:1.0 to 5.5:1.0, 2.0:1.0 to 5.0:1.0, 2.0:1.0 to 4.5:1.0, 2.0:1.0 to 4.0:1.0, 2.0:1.0 to 3.5:1.0, 2.0:1.0 to 3.0:1.0, 2.0:1.0 to 2.5:1.0, 2.5:1.0 to 3.0:1.0, 3.0:1.0 to 3.5:1.0, 3.5:1.0 to 4.5:1.0, 4.5:1.0 to 5.0:1.0, 2.5:1.0 to 3.5:1.0, 2.5:1.0 to 4.0:1.0, 2.5:1.0 to 4.5:1.0, 2.5:1.0 to 5.0:1.0, 3.0:1.0 to 4.0:1.0, 3.0:1.0 to 4.5:1.0, 3.0:1.0 to 5,0:1.0, 3.5:1.0 to 4.5:1.0, 3.5:1.0 to 5.0:1.0, or 4.0:1.0 to 5.0:1.0.

[0196] In one embodiment, the molar ratio of the PSMA I&T to 177Lu in the composition is from 0.5:1.0 to 5.0:1.0. In another embodiment, the molar ratio of the PSMA I&T to 177Lu in the composition is 0.5:1.0, 0.6:1.0, 0.7:1.0, 0.8:1.0, 0.9:1.0, 1.0:1.0, 1.1:1.0, 1.2:1.0, 1.3:1.0, 1.4:1.0, 1.5:1.0, 1.6:1.0, 1.7:1.0, 1.8:1.0, 1.9:1.0, 2.0:1.0, 2.1:1.0, 2.2:1.0, 2.3:1.0, 2.4:1.0, 2.5:1.0, 2.6:1.0, 2.7:1.0, 2.8:1.0, 2.9:1.0, 3.0:1.0, 3.1:1.0, 3.2:1.0, 3.3:1.0, 3.4:1.0, 3.5:1.0, 3.6:1.0, 3.7:1.0, 3.8:1.0, 3.9:1.0, 4.0:1.0, 4.1:1.0, 4.2:1.0, 4.3:1.0, 4.4:1.0, 4.5:1.0, 4.6:1.0, 4.7:1.0, 4.8:1.0, 4.9:1.0, or 5.0:1.0.

[0197] In one embodiment, the molar ratio of the PSMA I&T to 177Lu in the composition is from 5.0:1.0 to 12.0:1.0. In another embodiment, the molar ratio of the PSMA I&T to 177Lu in the composition is from 5.0:1.0 to 12.0:1.0, 5.0:1.0 to 11.5:1.0, 5.0:1.0 to 11.0:1.0, 5.0:1.0 to 10.5:1.0, 5.0:1.0 to 10.0:1.0, 5.0:1.0 to 9.5:1.0, 5.0:1.0 to 9.0:1.0, 5.0:1.0 to 8.5:1.0, 5.0:1.0 to 8.0:1.0, 5.0:1.0 to 7.5:1.0, 5.0:1.0 to 7.0:1.0, 5.0:1.0 to 6.5:1.0, or 5.0:1.0 to 6.0:1.0. In another embodiment, the molar ratio of the PSMA I&T to 177Lu in the composition is from 4.0:1.0 to 11.0:1.0, 4.0:1.0 to 10.5:1.0, 4.0:1.0 to 10.0:1.0, 4.0:1.0 to 9.5:1.0, 4.0:1.0 to 9.0:1.0, 4.0:1.0 to 8.5:1.0, 4.0:1.0 to 8.0:1.0, 4.0:1.0 to 7.9:1.0, 4.0:1.0 to 7.8:1.0, 4.0:1.0 to 7.7:1.0, 4.0:1.0 to 7.6:1.0, 4.0:1.0 to 7.5:1.0, 4.0:1.0 to 7.4:1.0, 4.0:1.0 to 7.3:1.0, 4.0:1.0 to 7.2:1.0, 4.0:1.0 to 7.1:1.0, 4.0:1.0 to 7.0:1.0, 4.0:1.0 to 6.5:1.0, or 4.0:1.0 to 6.0:1.0.

[0198] In one embodiment, at the time of administration, the molar ratio of the PSMA I&T to 177Lu in the composition is from 3.0:1.0 to 11.0:1.0. In another embodiment, the molar ratio of the PSMA I&T to 177Lu in the composition is from 3.0:1.0 to 11.0:1.0, 3.0:1.0 to 10.5:1.0, 3.0:1.0 to 10.0:1.0, 3.0:1.0 to 9.5:1.0, 30:1.0 to 9.0:1.0, 3.0:1.0 to 8.5:1.0, 3.0:1.0 to 8.0:1.0, 3.0:1.0 to 7.9:1.0, 3.0:1.0 to 7.8:1.0, 3.0:1.0 to 7.7:1.0, 3.0:1.0 to 7.6:1.0, 3.0:1.0 to 7.5:1.0, 3.0:1.0 to 7.4:1.0, 3.0:1.0 to 7.3:1.0, 3.0:1.0 to 7.2:1.0, 3.0:1.0 to 7.1:1.0, 3.0:1.0 to 7.0:1.0, 3.0:1.0 to 6.5:1.0, or 3.0:1.0 to 6.0:1.0.

[0199] In one embodiment, at the time of administration, the molar ratio of the PSMA I&T to 177Lu in the composition is from 11.0:1.0 to 12.0:1.0, 11.1:1.0 to 11.9:1.0, 11.2:1.0 to 11.8:1.0, 11.3:1.0 to 11.7:1.0, or 11.4:1.0 to 11.6:1.0. In another embodiment, the molar ratio of the PSMA I&T to 177Lu in the composition is from 10.0:1.0 to 11.0:1.0, 10.1:1.0 to 10.9:1.0, 10.2:1.0 to 10.8:1.0, 10.3:1.0 to 10.7:1.0, or 10.4:1.0 to 10.6:1.0.

[0200] In one embodiment, the molar ratio of the PSMA I&T to 177Lu in the composition is from 9.0:1.0 to 10.0:1.0, 9.1:1.0 to 9.9:1.0, 9.2:1.0 to 9.8:1.0, 9.3:1.0 to 9.7:1.0, or 9.4:1.0 to 9.6:1.0. In another embodiment, the molar ratio of the PSMA I&T to 177Lu in the composition is from 8.0:1.0 to 9.0:1.0, 8.1:1.0 to 8.9:1.0, 8.2:1.0 to 8.8:1.0, 8.3:1.0 to 8.7:1.0, or 8.4:1.0 to 8.6:1.0. In another embodiment, the molar ratio of the PSMA I&T to 177Lu in the composition is from 7.0:1.0 to 8.0:1.0, 7.1:1.0 to 7.9:1.0, 7.2:1.0 to 7.8:1.0, 7.3:1.0 to 7.7:1.0, or 7.4:1.0 to 7.6:1.0. In another embodiment, the molar ratio of the PSMA I&T to 177Lu in the composition is from 6.0:1.0 to 7.0:1.0, 6.1:1.0 to 6.9:1.0, 6.2:1.0 to 7.8:1.0, 7.3:1.0 to 7.7:1.0, or 7.4:1.0 to 6.6:1.0. In another embodiment, the molar ratio of the PSMA I&T to 177Lu in the composition is from 5.0:1.0 to 6.0:1.0, 5.1:1.0 to 5.9:1.0, 5.2:1.0 to 5.8:1.0, 5.3:1.0 to 5.7.0:1.0, or 5.4:1.0 to 5.6:1.0. In another embodiment, the molar ratio of the PSMA I&T to 177Lu in the composition is from 3.0:1.0 to 5.0:1.0, 3.1:1.0 to 4.9:1.0, 3.2:1.0 to 4.8:1.0, 3.3:1.0 to 4.7:1.0, or 3.4:1.0 to 4.6:1.0.

[0201] In another embodiment, the molar ratio of the PSMA I&T to 177Lu in the composition is from 4.0:1.0 to 5.0:1.0, about 4.0:1.0 to about 4.5:1.0, about 4.5:1.0 to about 5.0:1.0, 4.1:1.0 to 4.9:1.0, 4.2:1.0 to 4.8:1.0, 4.3:1.0 to 4.7.0:1.0, or 4.4:1.0 to 4.6:1.0. In an embodiment, the molar ratio of the PSMA I&T to 177Lu in the composition is about 5.0:1.0 to about 5.5:1.0, about 5.5:1.0 to about 6.0:1.0, about 6.0:1.0 to about 6.5:1.0, about 6.5:1.0 to about 7.0:1.0, about 7.0:1.0 to about 7.5:1.0, about 7.5:1.0 to about 8.0:1.0, about 8.0:1.0 to about 8.5:1.0, about 8.5:1.0 to about 9.0:1.0, about 9.0:1.0 to about 9.5:1.0, about 9.5:1.0 to about 10.0:1.0, about 10.0:1.0 to about 10.5:1.0, about 10.5:1.0 to about 11.0:1.0, about 11.0:1.0 to about 11.5:1.0, or about 11.5:1.0 to about 12.0:1.0.

[0202] In some embodiments, the total amount of 177Lu-PSMA I&T present in the radiopharmaceutical composition may range from about 1.0 μg / ml to about 3 g / ml, from about 1 μg / ml to about 2 μg / ml, from about 1 μg / ml to about 2.5 μg / ml, from about 1.1 μg / ml to about 2 μg / ml, from about 1.1 μg / ml to about 1.9 μg / ml, from about 1.1 μg / ml to about 1.9 μg / ml, from about 1.1 μg / ml to about 1.7 μg / ml, from about 1.1 μg / ml to about 1.6 μg / ml, from about 1.1 μg / ml to about 1.5 μg / ml, from about 1.1 μg / ml to about 1.4 μg / ml, or from about 1.1 μg / ml to about 1.3 μg / ml. In another embodiment, the total amount of 177Lu-PSMA I&T in the radiopharmaceutical composition may range from about 0.5 μg / ml to about 1.5 g / ml. In various embodiments, the total amount of 177Lu-PSMA I&T present in the radiopharmaceutical composition may be about 0.5 g / ml, about 0.6 μg / ml, about 0.7 μg / ml, about 0.8 μg / ml, about 0.9 μg / ml, about 1.0 μg / ml, about 1.1 μg / ml, about 1.2 μg / ml, about 1.3 μg / ml, about 1.4 μg / ml, about 1.5 μg / ml, about 1.6 μg / ml, about 1.7 μg / ml, about 1.8 μg / ml, about 1.9 μg / ml, about 2.0 μg / ml, or about 2.1 μg / ml.

[0203] In some embodiments, the total amount of 177Lu-PSMA I&T present in the radiopharmaceutical composition may range from about 3.0 μg / ml to about 9.0 μg / ml, from about 3.5 μg / ml to about 8.5 μg / ml, from about 4.0 μg / ml to about 8.0 μg / ml, from about 4.5 μg / ml to about 7.5 μg / ml, from about 5.0 μg / ml to about 7.0 μg / ml, or from about 5.5 μg / ml to about 6.5 μg / ml. In another embodiment, the total amount of 177Lu-PSMA I&T in the radiopharmaceutical composition may range from about 0.5 μg / ml to about 1.5 μg / ml.

[0204] In some embodiments, the total amount of 177Lu-PSMA I&T present in the radiopharmaceutical composition may be less than 2.0 μg / ml. In other embodiments, the total amount of 177Lu-PSMA I&T present in the radiopharmaceutical composition may be less than 4.0 μg / ml. In other embodiments, the total amount of 177Lu-PSMA I&T present in the radiopharmaceutical composition may be less than 5.0 μg / ml. In other embodiments, the total amount of 177Lu-PSMA I&T present in the radiopharmaceutical composition may be less than 6.0 μg / ml. In other embodiments, the total amount of 177Lu-PSMA I&T present in the radiopharmaceutical composition may be less than 3.0 μg / ml.

[0205] In some embodiments, the total amount of 177Lu-PSMA I&T present in the radiopharmaceutical composition may range from about 9 μg / ml to 20 μg / ml, 10 μg / ml to 20 μg / ml, 11 μg / ml to 20 μg / ml, 11 μg / ml to 15 μg / ml, 11 μg / ml to 14 μg / ml, or 11 μg / ml to 13 μg / ml. In another embodiment, the total amount of 177Lu-PSMA I&T in the radiopharmaceutical composition may range from about 5 μg / ml to about 15 μg / ml. In various embodiments, the total amount of 177Lu-PSMA I&T present in the radiopharmaceutical composition may be about 5 μg / ml, 6 μg / ml, 7 μg / ml, 8 μg / ml, 9 μg / ml, 10 μg / ml, 11 μg / ml, 12 μg / ml, 13 μg / ml, 14 μg / ml, 15 μg / ml, 16 μg / ml, 17 μg / ml, or 18 μg / ml. The composition may have less than 12 μg / ml or less than 6 μg / ml of Lu-PSMA I&T.

[0206] The radioactivity / volume of 177Lu-PSMA I&T in the composition may be adjusted according to dose strength. In an embodiment, the composition may include 0.5 GBq (13.5 mCi) of 177Lu-PSMA I&T in a 1 ml solution. In other words, the composition may include 10 GBq (270 mCi) of 177Lu-PSMA I&T in a 20 ml solution. In another embodiment, the composition may include 1 GBq (27 mCi) of 177Lu-PSMA I&T in a 1 ml solution. In other words, the composition may include 10 GBq (270 mCi) of 177Lu-PSMA I&T in a 10 ml solution at time of synthesis.

[0207] In one embodiment, the radioactivity concentration of the 177Lu-PSMA I&T in the radiopharmaceutical composition is less than about 50 mCi / ml, less than about 45 mCi / ml, less than about 40 mCi / ml, less than about 35 mCi / ml, less than about 30 mCi / ml, less than about 25 mCi / ml, less than about 20 mCi / ml, or less than about 15 mCi / ml. In another embodiment, the radioactivity concentration of the 177Lu-PSMA I&T in the radiopharmaceutical composition is from about 5 mCi / ml to about 30 mCi / ml, from about 10 mCi / ml to about 20 mCi / ml, from about 10 mCi / ml to about 15 mCi / ml, from about 10 mCi / ml to about 20 mCi / ml, or from about 13 mCi / ml to about 30 mCi / ml. In one specific embodiment, the radioactivity concentration of the 177Lu-PSMA I&T in the radiopharmaceutical composition is about 5 mCi / ml, about 10 mCi / ml, about 13.5 mCi / ml, about 15 mCi / ml, about 20 mCi / ml, about 27 mCi / ml, about 30 mCi / ml, about 30 mCi / ml, about 35 mCi / ml or about 40 mCi / ml. In another embodiment, the radioactivity concentration of the 177Lu-PSMA I&T in the radiopharmaceutical composition is from about 10 mCi / ml to about 15 mCi / ml, from about 10 mCi / ml to about 20 mCi / ml.

[0208] In one embodiment, the radioactivity of the 177Lu-PSMA I&T in the radiopharmaceutical composition is less than about 500 mCi, less than about 450 mCi, less than about 400 mCi, less than about 350 mCi, less than about 300 mCi, less than about 250 mCi, or less than about 200 mCi per vial. In another embodiment, the radioactivity of the 177Lu-PSMA I&T in the radiopharmaceutical composition is from about 10 mCi to about 400 mCi per vial. In one specific embodiment, the radioactivity of the 177Lu-PSMA I&T in the radiopharmaceutical composition is about 27 mCi, 150 mCi, about 160 mCi, about 170 mCi, about 180 mCi, about 190 mCi, about 200 mCi, about 250 mCi, about 270 mCi, about 300 mCi, about 313 mCi, about 318 mCi, about 338 mCi, about 345 mCi, about 346 mCi, about 354 mCi, about 360 mCi, about 370 mCi, about 380 mCi, about 390 mCi per vial.

[0209] In yet another embodiment, the 177Lu-PSMA I&T drug product has a standard radioactivity concentration of about 12 mCi / ml or about 32 mCi / ml at the end of production. In one embodiment, the 177Lu-PSMA I&T drug product has standard radioactivity concentration of about 13.5 mCi / ml or about 27 mCi / ml at the end of production.(ii) Antioxidant

[0210] The antioxidant may act as a buffer and / or stabilizing agent. The total amount of antioxidant in the radiopharmaceutical composition can and will vary. Examples of suitable antioxidants include but are not limited to ascorbic acid or gentisic acid. The amount of antioxidant in the composition may range from about 10 mg / ml to 90 mg / ml, about 15 mg / ml to 85 mg / ml, about 20 mg / ml to 80 mg / ml, about 25 mg / ml to 75 mg / ml, about 30 mg / ml to 70 mg / ml, about 35 mg / ml to 65 mg / ml, about 40 mg / ml to 60 mg / ml, or about 45 mg / ml to 55 mg / ml. Said in another way, the amount of antioxidant in the composition may range from about 10 mg to 90 mg, about 15 mg to 85 mg, about 20 mg to 80 mg, about 25 mg to 75 mg, about 30 mg to 70 mg, about 35 mg to 65 mg, about 40 mg to 60 mg, or about 45 mg to 55 mg per ml.

[0211] In an embodiment, there may be ≤10 mg / ml, ≤9.5 mg / ml, ≤9 mg / ml, ≤8.5 mg / ml, ≤8 mg / ml, ≤7.5 mg / ml, ≤7 mg / ml, ≤6.5 mg / ml, ≤6 mg / ml, ≤5.5 mg / ml, 5 mg / ml, ≤4.5 mg / ml, ≤4 mg / ml, ≤3.5 mg / ml, ≤3 mg / ml, ≤2.5 mg / ml, ≤2 mg / ml, ≤1.5 mg / ml, ≤1 mg / ml, or ≤0.5 mg / ml antioxidant.

[0212] In an embodiment, the antioxidant may be ascorbic acid and / or ascorbate. Ascorbic acid and / or ascorbate may minimize or reduce radiolysis of radiolabeled compositions.

[0213] In some embodiments, ascorbic acid present in the radiopharmaceutical composition may range from about 10 to about 50 mg, from about 20 to about 50 mg, from about 30 to about 50 mg or from about 35 to about 45 mg per ml. In another embodiment, ascorbic acid in the radiopharmaceutical composition may range from about 5 mg to about 50 mg per ml. In another embodiment, there may be ≤10 mg / ml, ≤9.5 mg / ml, ≤9 mg / ml, ≤8.5 mg / ml, ≤8 mg / ml, ≤7.5 mg / ml, ≤7 mg / ml, ≤6.5 mg / ml, ≤6 mg / ml, ≤5.5 mg / ml, 5 mg / ml, ≤4.5 mg / ml, ≤4 mg / ml, ≤3.5 mg / ml, ≤3 mg / ml, ≤2.5 mg / ml, ≤2 mg / ml, ≤1.5 mg / ml, ≤1 mg / ml, or ≤0.5 mg / ml ascorbic acid or ascorbate.

[0214] In various embodiments, ascorbic acid present in the radiopharmaceutical composition may be about 5 mg, about 10 mg, about 15 mg, about 20 mg, about 25 mg, about 30 mg, about 31 mg, about 35 mg, about 36 mg, about 37 mg, about 38 mg, about 39 mg, about 40 mg, about 40.5 mg, about 41 mg, about 41.5 mg, about 42 mg, about 42.5 mg, about 43 mg, about 43.5 mg, about 44 mg, about 44.5 mg, about 45 mg, about 46 mg, about 47 mg, about 48 mg, about 49 mg, about 50 mg, about 55 mg, about 60 mg, about 65 mg, about 70 mg, about 75 mg, about 80 mg, about 85 mg, or about 90 mg per ml. For example, the amount of ascorbic acid in 1 ml of the composition may be about 25 mg to 30 mg, about 30 mg to 35 mg, about 35 mg to 40 mg, or about 40 mg to 45 mg per ml.

[0215] In yet another embodiment, the concentration of ascorbic acid in the radiopharmaceutical composition may be from about 10 mg / ml to about 80 mg / ml, from about 10 mg / ml to about 75 mg / ml, from about 10 mg / ml to about 70 mg / ml, from about 15 mg / ml to about 80 mg / ml, from about 15 mg / ml to about 75 mg / ml, from about 15 mg / ml to about 70 mg / ml, from about 20 mg / ml to about 80 mg / ml, from about 20 mg / ml to about 75 mg / ml, from about 25 mg / ml to about 40 mg / ml, from about 20 mg / ml to about 80 mg / ml, from about 20 mg / ml to about 75 mg / ml, or from about 20 mg / ml to about 70 mg / ml.

[0216] In one specific embodiment, the concentration of ascorbic acid in the radiopharmaceutical composition is about 10 mg / ml, about 15 mg / ml, about 20 mg / ml, about 25 mg / ml, about 21 mg / ml, about 25 mg / ml, about 30 mg / ml, about 31 mg / ml, about 35 mg / ml, about 40 mg / ml, about 42.5 mg / ml, about 45 mg / ml, about 50 mg / ml, about 55 mg / ml, about 60 mg / ml, about 65 mg / ml, about 70 mg / ml, about 75 mg / ml, about 80 mg / ml, about 85 mg / ml, about 90 mg / ml, about 95 mg / ml, or about 100 mg / ml.

[0217] In at least one embodiment, the total amount of ascorbic acid in the radiopharmaceutical composition may be about 31 mg / ml. In a further embodiment, the total amount of ascorbic acid in the radiopharmaceutical composition may be about 15 mg / ml, about 21 mg / ml, about 25 mg / ml, about 31 mg / ml, 33 mg / ml, 35 mg / ml, or about 42.5 mg / ml.(iii) Stabilizing Agent

[0218] The stabilizing agent may be separate from the antioxidant. The total amount of stabilizing agent present in the radiopharmaceutical composition can and will vary. The stabilizing agent may further be used to limit or reduce radiolysis. The stabilizing agent may also function as a vehicle for the composition.

[0219] The stabilizing agent includes but is not limited to ethanol, para-aminebenzoic acid (PABA), dihydroxybenzoic acid (gentisate compounds), gentisic acid, cysteine, selenomethionine, ascorbic acid / sodium ascorbate, methionine, and combinations thereof. In an embodiment, the stabilizing agent includes ascorbic acid and sodium ascorbate.

[0220] In some embodiments, the stabilizing agent is ethanol. Ethanol may be present in the pharmaceutical composition at about 0.01% (v / v) to about 10% (v / v), 0.01% (v / v) to 3% (v / v), about 0.5% (v / v) to 1% (v / v), about 1% (v / v) to 2% (v / v), about 2% (v / v) to about 3% (v / v), about 3% (v / v) to 4% (v / v), about 3.5% to 4.5% (v / v), about 4% to 5% (v / v), about 4.5% (v / v) to 5.5% (v / v), about 5% (v / v) to 6% (v / v), about 5.5% (v / v) to 6.5% (v / v), about 6% (v / v) to 7% (v / v), about 6.5% (v / v) to 7.5% (v / v), or about 7% (v / v) to 8% (v / v). In some embodiments, the pharmaceutical composition comprises zero (0.00% v / v) ethanol (i.e., ethanol may be absent from the pharmaceutical composition).

[0221] In one embodiment, the total amount of ethanol present in the radiopharmaceutical composition is from about 3% (v / v) to about 8% (v / v), or from 2% (v / v) to about 4% (v / v), or from about 7% (v / v) to about 8% (v / v). In various embodiments, the total amount of ethanol present in the radiopharmaceutical composition may be about 1% (v / v), about 2% (v / v), about 3% (v / v), about 3.5% (v / v), about 3.8% (v / v), about 4% (v / v), about 4.5% (v / v), about 5% (v / v), about 5.5% (v / v), about 6% (v / v), about 6.5% (v / v), about 7% (v / v), about 7.5% (v / v), about 8% (v / v), about 8.5% (v / v), about 9% (v / v), about 9.5% (v / v), or about 10% (v / v).

[0222] In another embodiment, there may be ≤10 mg / ml, ≤9.5 mg / ml, ≤9 mg / ml, ≤8.5 mg / ml, ≤8 mg / ml, ≤7.5 mg / ml, ≤7 mg / ml, ≤6.5 mg / ml, ≤6 mg / ml, ≤5.5 mg / ml, 5 mg / ml, ≤4.5 mg / ml, ≤4 mg / ml, ≤3.5 mg / ml, ≤3 mg / ml, ≤2.5 mg / ml, ≤2 mg / ml, ≤1.5 mg / ml, ≤1 mg / ml, or ≤0.5 mg / ml gentisic acid or gentisate.

[0223] In at least one example, the radiopharmaceutical composition includes 3.8% (v / v) ethanol. In another example, the radiopharmaceutical composition includes 7.5% (v / v).

[0224] Stated alternatively, the total amount of ethanol present in the radiopharmaceutical composition may be about 5 mg, about 10 mg, about 15 mg, about 20 mg, about 25 mg, about 30 mg, about 35 mg, about 45 mg, about 50 mg, about 55 mg, about 60 mg, about 65 mg, about 70 mg, about 75 mg, about 80 mg, about 85 mg, about 90 mg, about 95 mg, about 100 mg, about 95 mg, about 100 mg, about 105 mg, about 110 mg, about 115 mg, or about 80 mg per ml.

[0225] In some embodiments, the total amount of ethanol present in the radiopharmaceutical composition may range from about 20 mg to about 35 mg per ml. In another embodiment, the total amount of ethanol in the radiopharmaceutical composition may range from about 43 mg to about 63 mg per ml.

[0226] In some embodiments, the total amount of ethanol present in the radiopharmaceutical composition may range from about 25 mg to 80 mg, about 30 to 40 mg, about 40 to 50 mg, about 50 to 60 mg, about 60 to 70 mg, or about 70 to 80 mg per. In another embodiment, the total amount of ethanol in the radiopharmaceutical composition may range from about 30 mg to about 60 mg per ml.

[0227] In a further embodiment, the ratio of ethanol in the radiopharmaceutical composition may be about 300 mg per 10 ml or about 30 mg / ml. In another embodiment, the ratio of ethanol in the radiopharmaceutical composition may be about 200 mg per 10 ml. In still another embodiment, the ratio of ethanol in the radiopharmaceutical composition may be about 350 mg per 10 ml.

[0228] Stated alternatively, the amount of ethanol in the composition may range from about 35 μl / ml to about 75 μl / ml. For example, the amount of ethanol in 1 ml of the composition may be about 35 μl to 40 μl, about 40 μl to 45 μl, about 45 μl to 50 μl, about 50 μl to 55 μl, about 55 μl to 60 μl, about 60 μl to 65 μl, about 65 μl to 70 μl, or about 70 μl to 75 μl. In at least one example, 1 ml of the composition includes 37.5 μl (29.5 mg) of ethanol. In another example, 1 ml of the composition includes 75 μl (58.9 mg) of ethanol.(iv) Metal Ion Chelator (Chelating Agent)

[0229] In some embodiments, the disclosure provides for a radiopharmaceutical composition with a micro dose of 177Lu-PSMA I&T solution and at least one metal ion chelator. A suitable chelating agent may include ethylenediamine tetracetic acid (EDTA) and its salts, N-(hydroxy-ethyl)ethylenediaminetriacetic acid, nitrilotriacetic acid (NTA), ethylene-bis(oxyethylene-nitrilo)tetraacetic acid, 1,4,7,10-tetraazacyclodo-decane-N,N′,N″,N′″-tetraacetic acid, 1,4,7,10-tetraaza-cyclododecane-N,N′,N″-triacetic acid, 1,4,7-tris(carboxymethyl)-10-(2′-hydroxypropyl)-1,4,7,10-tetraazocyclodecane, 1,4,7-triazacyclonane-N,N′,N″-triacetic acid, 1,4,8,11-tetraazacyclotetra-decane-N,N′,N″,N′″-tetraacetic acid; diethylenetriamine-pentaacetic acid (DTPA), ethylenedicysteine, bis(aminoethanethiol) carboxylic acid, triethylenetetraamine-hexaacetic acid, 1,2-diaminocyclohexane-N,N,N′,N′-tetraacetic acid, or a combination thereof. In one embodiment, the chelating agent may be the sodium salt of EDTA. In one embodiment, the chelating agent may comprise DTPA and an absence of EDTA.

[0230] In some embodiments, the metal ion chelator may be ethylenediamine tetracetic acid (EDTA) and its salts, N-(hydroxy-ethyl)ethylenediaminetriacetic acid, nitrilotriacetic acid (NTA), ethylene-bis(oxyethylene-nitrilo)tetraacetic acid, 1,4,7,10-tetraazacyclodo-decane-N,N′,N″,N″-tetraacetic acid, 1,4,7,10-tetraaza-cyclododecane-N,N′,N″-triacetic acid, 1,4,7-tris(carboxymethyl)-10-(2′-hydroxypropyl)-1,4,7,10-tetraazocyclodecane, 1,4,7-triazacyclonane-N,N′,N″-triacetic acid, 1,4,8,11-tetraazacyclotetra-decane-N,N′,N″,N′″-tetraacetic acid; diethylenetriamine-pentaacetic acid (DTPA), ethylenedicysteine, bis(aminoethanethiol) carboxylic acid, triethylenetetraamine-hexaacetic acid, and 1,2-diaminocyclohexane-N,N,N′,N′-tetraacetic acid. In one embodiment, the metal ion chelator may be disodium EDTA. In one embodiment, the metal ion chelator may be DPTA.

[0231] In one embodiment, the amount of chelating agent present in the radiopharmaceutical composition may range from about 5 μg to 500 μg. In some embodiments, the amount of metal ion chelator present in the radiopharmaceutical composition may range from about 5 μg to 50 μg.

[0232] In some embodiments, the amount of chelating agent present may be about 5 μg, about 6 μg, about 7 μg, about 8 μg, about 9 μg, about 10.5 μg, about 11 μg, about 12 μg, about 13 μg, about 14 μg, about 15 μg, about 16 μg, about 17 μg, about 18 μg, about 19 μg, about 20 μg, about 21 μg, about 22 μg, about 23 μg, about 24 μg, about 25 μg, about 26 μg, about 27 μg, about 28 μg, about 29 μg, about 30 μg, about 31 μg, about 32 μg, about 33 μg, about 34 μg, about 35 μg, about 36 μg, about 37 μg, about 38 μg, about 39 μg, about 40 μg, about 45 μg, about 50 μg, about 60 μg, about 70 μg, about 80 μg, about 90 μg, about 100 μg, about 110 μg, about 80 μg, about 130 μg, about 140 μg, about 150 μg, about 160 μg, about 170 μg, about 180 μg, about 190 μg, about 200 μg, about 210 μg, about 220 μg, about 230 μg, about 240 μg, about 250 μg, about 260 μg, about 270 μg, about 280 μg, about 290 μg, about 300 μg, about 310 μg, about 320 μg, about 330 μg, about 340 μg, about 350 μg, about 360 μg, about 370 μg, about 380 μg, about 390 μg, about 400 μg, about 410 μg, about 420 μg, about 430 μg, about 440 μg, about 450 μg, about 460 μg, about 470 μg, about 480 μg, about 490 μg, or about 500 μg.

[0233] The concentration of metal ion chelator in the composition may range from about 5 μg / ml to about 500 μg / ml. In another embodiment, the concentration of chelating agent present in the radiopharmaceutical composition may range from about 5 μg / ml to about 200 μg / ml. In another embodiment, the concentration of chelating agent present in the radiopharmaceutical composition may range from about 5 μg / ml to 75μg / ml, 10 μg / ml to about 25 μg / ml, about 25 μg / ml to about 50 μg / ml, about 50 μg / ml to about 75 μg / ml, or about 75 μg / ml to about 100 μg / ml, about 100 μg / ml to about 125 μg / ml, about 125 μg / ml to about 150 μg / ml, or about 150 μg / ml to about 200 μg / ml.

[0234] In some embodiments, the concentration of chelating agent present may be about 5 μg / ml, about 6 μg / ml, about 7 μg / ml, about 8 μg / ml, about 9 μg / ml, about 10.5 μg / ml, about 11 μg / ml, about 12 μg / ml, about 13 μg / ml, about 14 μg / ml, about 15 μg / ml, about 16 μg / ml, about 17 μg / ml, about 18 μg / ml, about 19 μg / ml, about 20 μg / ml, about 21 μg / ml, about 22 μg / ml, about 23 μg / ml, about 24 μg / ml, about 25 μg / ml, about 26 μg / ml, about 27 μg / ml, about 28 μg / ml, about 29 μg / ml, about 30 μg / ml, about 31 μg / ml, about 32 μg / ml, about 33 μg / ml, about 34 μg / ml, about 35 μg / ml, about 36 μg / ml, about 37 μg / ml, about 38 μg / ml, about 39 μg / ml, about 40 μg / ml, about 45 μg / ml, or about 50 μg / ml. In another embodiment, the concentration of chelating agent present in the radiopharmaceutical composition may range from about 100 μg / ml to about 125 μg / ml, about 125 μg / ml to about 150 μg / ml, or about 150 μg / ml to about 200 g / ml.

[0235] In other embodiments, the concentration of chelating agent present may be about 80 μg / ml, about 90 μg / ml, about 91 μg / ml, about 92 μg / ml, about 93 μg / ml, about 94 μg / ml, about 95 μg / ml, about 96 μg / ml, about 97 μg / ml, about 98 μg / ml, about 99 μg / ml, about 100 μg / ml, about 101 μg / ml, about 102 μg / ml, about 103 μg / ml, about 104 μg / ml, about 105 μg / ml, about 106 μg / ml, about 107 μg / ml, about 108 μg / ml, about 109 μg / ml, about 110 μg / ml, about 115 μg / ml, about 120 μg / ml, about 125 μg / ml, about 130 μg / ml, about 135 μg / ml, about 140 μg / ml, about 145 μg / ml, about 150 μg / ml, about 155 μg / ml, about 160 μg / ml, about 170 μg / ml, about 180 μg / ml, about 190 μg / ml, or about 200 μg / ml.

[0236] In another embodiment, the amount of metal ion chelator in the radiopharmaceutical composition may be from about 0.001% to about 0.20% (w / w), about 0.20% to about 0.40% (w / w), about 0.40% to about 0.60% (w / w), about 0.60% to about 0.80% (w / w), or about 0.80% to about 1.00% (w / w) of such radiopharmaceutical composition. In some embodiments, the amount of metal ion chelator present in a radiopharmaceutical composition may be about 0.001%, 0.002%, 0.003%, 0.004%, 0.005%, 0.01%, 0.02%, 0.03%, 0.04%, 0.05%, 0.06%, 0.07%, 0.08%, 0.09%, 0.10%, 0.11%, 0.12%, 0.13%, 0.14%, or 0.15% (w / w) of the total weight of the radiopharmaceutical composition.

[0237] For example, the amount of disodium EDTA, diethylenetriamine-pentaacetic acid (DTPA), or a combination thereof in 1 ml of the composition may be about 10 μg to 15 μg, about 13 μg to 18 μg, about 15 μg to 20 μg, about 20 μg to 25 μg, about 25 μg to 50 μg, about 50 μg to 75 μg, or about 75 μg to 150 μg. In some embodiments, the amount of disodium EDTA present may be about 5 μg, about 6 μg, about 7 μg, about 8 μg, about 9 μg, about 10.5 μg, about 11 μg, about 12 μg, about 13 μg, about 14 μg, about 15 μg, about 16 μg, about 17 μg, about 18 μg, about 19 μg, about 20 μg, about 21 μg, about 22 μg, about 23 μg, about 24 μg, about 25 μg, about 26 μg, about 27 μg, about 28 μg, about 29 μg, about 30 μg, about 31 μg, about 32 μg, about 33 μg, about 34 μg, about 35 μg, about 36 μg, about 37 μg, about 38 μg, about 39 μg, about 40 μg, about 45 μg, or about 50 μg.

[0238] In at least one example, 1 ml of the composition includes 15.5 μg of disodium EDTA. In another example, 1 ml of the composition includes 21 μg of disodium EDTA.

[0239] In one embodiment, trace metal content in the composition is undetectable. In another embodiment, the Fe metal content in the composition is ≤0.05 μg / GBq, ≤0.03 μg / GBq, ≤0.01 μg / GBq, or below the detectable limit. In another embodiment, the Cu metal content in the composition is ≤0.05 μg / GBq, ≤0.03 μg / GBq, ≤0.01 μg / GBq, or below the detectable limit. In another embodiment, the Zn metal content in the composition is ≤0.05 μg / GBq, ≤0.03 μg / GBq, ≤0.01 μg / GBq, or below the detectable limit. In another embodiment, the Pb metal content in the composition is ≤0.05 μg / GBq, ≤0.03 μg / GBq, ≤0.01 μg / GBq, or below the detectable limit. In another embodiment, the Co metal content in the composition is ≤0.05 μg / GBq, ≤0.03 μg / GBq, ≤0.01 μg / GBq, or below the detectable limit. In another embodiment, the Ni metal content in the composition is ≤0.05 μg / GBq, ≤0.03 μg / GBq, ≤0.01 μg / GBq, or below the detectable limit. In another embodiment, the Zn metal content in the composition is ≤0.05 μg / GBq, ≤0.03 μg / GBq, ≤0.01 μg / GBq, or below the detectable limit. In another embodiment, the Cr metal content in the composition is ≤0.05 μg / GBq, ≤0.03 μg / GBq, ≤0.01 μg / GBq, or below the detectable limit. In another embodiment, the Yb metal content in the composition is ≤0.05 μg / GBq, ≤0.03 μg / GBq, ≤0.01 μg / GBq, or below the detectable limit.

[0240] In another embodiment, the compositions described herein comprise M-PSMA I&T wherein M=Cu, Pb, Co, Fe, Ni, Zn, Cr, and / or Yb, and the total combined concentration of M-PSMA I&T is less than 500 ppm, less than 400 ppm, less than 300 ppm, less than 200 ppm, less than 100 ppm, less than 50 ppm, less than 40 ppm, less than 30 ppm, less than 20 ppm, less than 10 ppm, less than 9 ppm, less than 8 ppm, less than 7 ppm, less than 6 ppm, less than 5 ppm, less than 4 ppm, less than 3 ppm, less than 2 ppm, or less than 1 ppm. In another embodiment, the compositions described herein comprise less than 500 ppm, less than 400 ppm, less than 300 ppm, less than 200 ppm, less than 100 ppm, less than 50 ppm, less than 40 ppm, less than 30 ppm, less than 20 ppm, less than 10 ppm, less than 9 ppm, less than 8 ppm, less than 7 ppm, less than 6 ppm, less than 5 ppm, less than 4 ppm, less than 3 ppm, less than 2 ppm, or less than 1 ppm of Cu-PSMA I&T. In another embodiment, the compositions described herein comprise less than 500 ppm, less than 400 ppm, less than 300 ppm, less than 200 ppm, less than 100 ppm, less than 50 ppm, less than 40 ppm, less than 30 ppm, less than 20 ppm, less than 10 ppm, less than 9 ppm, less than 8 ppm, less than 7 ppm, less than 6 ppm, less than 5 ppm, less than 4 ppm, less than 3 ppm, less than 2 ppm, or less than 1 ppm of Pb-PSMA I&T. In another embodiment, the compositions described herein comprise less than 500 ppm, less than 400 ppm, less than 300 ppm, less than 200 ppm, less than 100 ppm, less than 50 ppm, less than 40 ppm, less than 30 ppm, less than 20 ppm, less than 10 ppm, less than 9 ppm, less than 8 ppm, less than 7 ppm, less than 6 ppm, less than 5 ppm, less than 4 ppm, less than 3 ppm, less than 2 ppm, or less than 1 ppm of Co-PSMA I&T. In another embodiment, the compositions described herein less than 500 ppm, less than 400 ppm, less than 300 ppm, less than 200 ppm, less than 100 ppm, less than 50 ppm, less than 40 ppm, less than 30 ppm, less than 20 ppm, less than 10 ppm, less than 9 ppm, less than 8 ppm, less than 7 ppm, less than 6 ppm, less than 5 ppm, less than 4 ppm, less than 3 ppm, less than 2 ppm, or less than 1 ppm of Fe-PSMA I&T. In another embodiment, the compositions described herein comprise less than 500 ppm, less than 400 ppm, less than 300 ppm, less than 200 ppm, less than 100 ppm, less than 50 ppm, less than 40 ppm, less than 30 ppm, less than 20 ppm, less than 10 ppm, less than 9 ppm, less than 8 ppm, less than 7 ppm, less than 6 ppm, less than 5 ppm, less than 4 ppm, less than 3 ppm, less than 2 ppm, or less than 1 ppm Ni-PSMA I&T. In another embodiment, the compositions described herein comprise less than 500 ppm, less than 400 ppm, less than 300 ppm, less than 200 ppm, less than 100 ppm, less than 50 ppm, less than 40 ppm, less than 30 ppm, less than 20 ppm, less than 10 ppm, less than 9 ppm, less than 8 ppm, less than 7 ppm, less than 6 ppm, less than 5 ppm, less than 4 ppm, less than 3 ppm, less than 2 ppm, or less than 1 ppm Zn-PSMA I&T. In another embodiment, the compositions described herein comprise less than 500 ppm, less than 400 ppm, less than 300 ppm, less than 200 ppm, less than 100 ppm, less than 50 ppm, less than 40 ppm, less than 30 ppm, less than 20 ppm, less than 10 ppm, less than 9 ppm, less than 8 ppm, less than 7 ppm, less than 6 ppm, less than 5 ppm, less than 4 ppm, less than 3 ppm, less than 2 ppm, or less than 1 ppm Cr-PSMA I&T. In another embodiment, the compositions described herein comprise less than 500 ppm, less than 400 ppm, less than 300 ppm, less than 200 ppm, less than 100 ppm, less than 50 ppm, less than 40 ppm, less than 30 ppm, less than 20 ppm, less than 10 ppm, less than 9 ppm, less than 8 ppm, less than 7 ppm, less than 6 ppm, less than 5 ppm, less than 4 ppm, less than 3 ppm, less than 2 ppm, or less than 1 ppm Yb-PSMA I&T.(v) pH Adjuster

[0241] Suitable pH adjusters include but are not limited to any one of hydrochloric acid, sodium hydroxide, sodium bicarbonate, or combinations thereof.

[0242] In some embodiments, hydrochloric acid may be used to adjust the pH of the radiopharmaceutical composition. In an embodiment, the amount of hydrochloric acid in the composition may range from 0 mg / ml to about 2 mg / ml. In some embodiments, the amount of HCl may range from 1.6 ml of 0.05 M HCl to 2 ml of 0.04 M HCl in a production batch. In one embodiment, the batch has an activity of about 10 to 20 Ci. In another embodiment the batch has an activity of about 16 Ci. The amount of HCl in the composition may vary, to adjust the final formulation pH. In various embodiments, the final formulation pH ranges from pH 3.0 to 5.0. In at least one example, HCl is added to the composition until a final pH of 3.5±0.1 to 4.5±0.1 is reached.

[0243] In an embodiment, the amount of sodium bicarbonate in the composition may be a sufficient quantity control the pH of the composition to 5.5 to 7.0 prior to the addition of HCl.

[0244] In an embodiment, the amount of NaOH in the composition may be a sufficient quantity control the pH of the composition to 5.5 to 7.0 prior to the addition of HCl.(vi) Water

[0245] The composition may further include a sufficient amount of water to make the desired final volume for the solution for injection. For example, water may be added to make a final volume of 1 ml, 10 ml, 15 ml, or 20 ml.IV. Process of Making the Radiopharmaceutical Composition

[0246] The whole manufacturing process is a one-step radiolabelling process using a PSMA I&T precursor. The success of the labelling is dependent on temperature, time and pH. The reaction takes place in a reactor vial at elevated temperatures. For example, the reactor maybe heated at setpoint of 110° C. and the maximum temperature reached in the reaction solution is about 95° C. The radiolabeled product is isolated on a C18 cartridge and formulated to the final composition after elution to the bulk vial. The final product is dispensed in a grade A controlled environment.

[0247] In another embodiment, the radiolabelling process uses a PSMA I&T precursor and wherein the composition is radiolabeled for 5 to 15 minutes at a temperature of about 65 to about 75 degrees C. In yet another embodiment, the composition is radiolabeled for 5 to 15 minutes at a temperature of about 65 to about 80 degrees C. In another embodiment, the composition is radiolabeled for 5 to 15 minutes at a temperature of about 65, about 70, about 75, or about 80 degrees C. In another embodiment, the composition is radiolabeled for 5 to 15 minutes at a temperature of about 70 to about 80 degrees C. In yet another embodiment, the composition is radiolabeled for 5 to 15 minutes at a temperature of about 75 to 80 degrees C.

[0248] The 177Lu-PSMA I&T composition solution may be prepared using the following method 100, for example as shown in FIG. 2. The order of the steps may vary, such as the order of preparing the various solutions.

[0249] In an embodiment, step 102 may include preparing four solutions for the synthesis. The four solutions may include 0.04 M hydrochloric acid, 0.4 M sodium acetate, 20% (w / w) L-ascorbic acid, and PSMA I&T in water at about 460 to about 500 μg / ml. The PSMA I&T precursor may be dissolved in sterile water for injection. For example, 80 μg to 600 μg of precursor may be used in the reaction depending on the number of doses produced. In at least one example, 463 μl / ml of PSMA I&T precursor may be used to produce the composition.

[0250] In an embodiment, step 104 may include preparing an ascorbic acid solution (dilution buffer). In some examples, the ascorbic acid solution may be a 50 mg / ml ascorbic acid solution. The solution pH may be adjusted to 4.5±0.25, 4.5±0.30, 4.5±0.35, 4.5±0.40, 4.5±0.45, or 4.5±0.50. For example, 50 mg / ml ascorbic acid solution is prepared, and the pH of the solution is adjusted to 4.5 using 30% hydrochloric acid. In another example, the ascorbic acid solution may include 33 mg / ml ascorbic acid / sodium ascorbate at pH 4.25±0.25 and 0.1 mg / ml DTPA.

[0251] In an embodiment, optional step 106 may include preparing a formulation solution / buffer. The formulation solution is prepared from an injections grade solution containing ascorbic acid, absolute ethanol and injections grade water. In an example, the formulation solution is prepared by adding sufficient amounts of following solutions into the bulk vial: about 50 mg / ml ascorbic acid pH 4.5 solution (prepared in step 104), 30% ethanol solution, and water. The formulation solution may include 31 mg / ml to 42.5 mg / ml ascorbic acid and 3.8% to 7.5% ethanol (v / v %). In some embodiments, the formulation buffer may be adjusted to enable the final composition to have an extended shelf life. In at least one example, the formulation solution comprises 31 mg / ml ascorbic acid, 3.8% (v / v) ethanol, and pH 4.5. The formulation buffer is prepared ex tempore as part of the synthesis preparation and predetermined amount is added to the bulk vial as part of the synthesis preparations.

[0252] In an embodiment, step 108 may include preparing a reaction solution. A reaction solution may include sodium acetate, HCl, and L-ascorbic acid. Alternatively, a reaction solution may include sodium ascorbate. The reaction solution may be prepared in the reactor using solutions prepared in step 102. In an example, the reaction solution may include 4 ml 0.4 M sodium acetate, a volume of about 463 g / ml PSMA I&T solution, and 150 μl 20% (w / w) L-ascorbic acid. In another example, the reaction solution may include 0.33M sodium ascorbate (reaction buffer) and PSMA I&T in the reaction buffer. In some examples, the reaction solution may include 1.6 ml 0.05 M HCl or 2 ml 0.04 M HCl (0.08 mmol HCl). Ascorbic acid concentration in the reaction solution may range from 3.75 mg / ml to 5.00 mg / ml.

[0253] In an embodiment, step 110 may include preparing 177Lu. In some embodiments, 177Lu may be provided in HCl. [177Lu]LuCl3 may be provided in 0.04 M or 0.05 M HCl. For example, 40-44 GBq / ml of 177Lu may be provided in 0.04 M HCl. In another example, less than 61 GBq of 177Lu may be provided in 0.05 M HCl. The [177Lu]LuCl3 in 0.04 M or 0.05 M hydrochloric acid may be transferred into the reactor and the [177Lu]LuCl3 vial may be rinsed with an additional required volume of 0.04 M hydrochloric acid (prepared in step 102) that is also then transferred into the reactor.

[0254] The reaction volume may range from 6 ml to 8 ml. The volume may be dependent on the amount of precursor used.

[0255] In an embodiment, step 112 may include radiolabeling the PSMA-I&T with 177Lu. The reaction mixture may be heated up to about 75° C., up to about 80° C., up to about 85° C., up to about 90° C., or up to about 95° C. In an example, the setpoint for heating is 110° C. and the actual maximum temperature reached is about 95° C. The reaction volume may be heated for up to 5 minutes, up to 10 minutes, up to 15 minutes, or up to 20 minutes. In at least one example, the reaction mixture is heated at setpoint of 110° C. for 15 minutes. In at least one additional example, the reaction mixture is heated at a setpoint of 75° C. for 10 minutes.

[0256] In an embodiment, optional step 114 may include purifying the reaction mixture. For example, the solution may be run through a cassette / cartridge containing a hydrophobic, reverse-phase, silica-based bonded phase (e.g., C18 Sep-Pak). In at least one example, the reaction mixture may be passed through a C18 Sep Pak cartridge and the cartridge is rinsed with water. 177Lu-PSMA I&T product is retained in the cartridge. In some embodiments, the reaction mixture may not be purified.

[0257] In an embodiment, step 116 may include eluting or diluting the final product. In an example, the 177Lu-PSMA I&T is diluted with dilution buffer prepared in step 104 to the desired radioactivity concentration. The composition may be eluted using 1.5 ml of ethanol-water in a 1:1 ratio. The cassette may then be flushed using 8.5 ml ascorbic acid 50 mg / ml. A formulation solution may then be added to form the final composition. In at least one example, 177Lu-PSMA I&T is eluted from the C18 cartridge with 1.5 ml of 50% (v / v) ethanol followed by 8.5 ml of 50 mg / ml pH 4.5 ascorbic acid solution (prepared in step 104) into the bulk vial where it is diluted with formulation solution / buffer (prepared in step 106, already in the bulk vial). The resulting solution may have a pH of 3.5 to 4.5. In some embodiments, the pH may be adjusted. In an example, the 50 mg / ml ascorbic acid solution pH is adjusted to 3.5 to 4.5. In other examples the pH is adjusted to 5.0 or less.

[0258] Presumably the stability enhancing conditions, such as ascorbic acid solution at pH of about 5 or below, should preferably be applied as early as possible in the process. For example, ascorbic acid solutions at pH 5 or below may be used instead of water at step 114 to minimize radiolytic damage.

[0259] The final composition may be formulated as a solution suitable for injection. The product is diluted to a standard radioactivity concentration, and therefore, the final volume of the bulk composition varies depending on the starting radioactivity of 177Lu introduced. The solution meets the requirements for sterility and bacterial endotoxins according to the European and United States pharmacopoeia, confirming an acceptable manufacturing process from a microbial point of view.

[0260] In some embodiments, at step 118 the final composition may be sterile filtered. The sterile filter may be a 0.22 μm sterile filter. The final product may be dispensed through a 0.22 μm sterile filter into single dose vials containing suitable volume and radioactivity referenced to the prescribed calibration time. For example, the final composition may be dispensed through a 0.22 μm sterile filter under a Class A environment into doses containing suitable volume and radioactivity at a calibration time.

[0261] FIG. 3A provides one example of the process of making a radiopharmaceutical composition with purification of the reaction mixture and the formulation solution with ethanol. FIG. 3B provides one example of the process of making a radiopharmaceutical composition without purification and without ethanol.

[0262] Provided herein are methods for increasing the shelf life of a radiopharmaceutical product comprising 177Lu-PSMA I&T. The methods may include adjusting the pH of the composition to 3.5, 3.75, 4.0, 4.25, or 4.5, adjusting the amount of ascorbic acid in the composition, and / or adjusting the radioactivity to increase the shelf life of the composition by 0.25, 0.5, 0.75, 1, 1.25, 1.5, 2, 2.25, 2.5, 2.75, or 3 days. For example, the radiopharmaceutical composition may have a shelf life of 1, 1.5, 2, 2.25, 2.5, 2.75, 3, 3.25, 3.5, 3.75, 4, 4.25, 4.5, 4.75, or 5 days. In an embodiment, adjusting the pH, radioactivity, and / or ascorbic acid may increase the radiochemical purity of the composition to at least 99%, at least 98.5%, at least 98%, at least 97.5%, at least 97%, at least 96.5%, at least 96%, at least 95.5%, or at least 95% for up to 1, 1.5, 2, 2.25, 2.5, 2.75, 3, 3.25, 3.5, 3.75, 4, 4.25, 4.5, 4.75, or 5 days.

[0263] Target pharmaceutical formulations in accordance with the present disclosure are as provided in Table 1A.TABLE 1ATarget pharmaceutical formulationsTarget Pharmaceutical FormulationComposi-Composi-Composi-Componenttions 1 and 2tion 3tion 4Radioactivity~1.0 GBq / mL or0.5-0.6 GBq / mL or0.5 GBq / mL orconcentration27 mCi / mL13.5-16.2 mCi / mL13.3 mCi / mLAscorbic acid42.5mg / mL31mg / mL33mg / mLDisodium21μg / mL15.5μg / mLN / AEDTADTPAN / AN / A100μg / mLEthanol7.5% (v / v %)3.8% (v / v %)N / ApH5.54.54.25Shelf-life48h72h72h(tested upto 40° C.)

[0264] In another embodiment in making the Composition 4 disclosed in Table 1A above may be performed using a one-step radiolabelling process performed in the following steps.

[0265] The success of the labelling is dependent on temperature, time and pH. The reaction takes place in a reactor vial at elevated temperatures. For example, the reactor may be pre-heated at setpoint of 100° C. for 5 minutes and then reduced to 85° C. to achieve a reaction temperature of about 75° C. for 10 minutes. The radiolabeled product is formulated to the final composition, sterile filtered, and dispensed in a grade A controlled environment.

[0266] The 177Lu-PSMA I&T composition solutions may be prepared as shown in FIG. 2B (201, 202, 203). The order of the steps may vary, such as the order of preparing the various solutions.

[0267] In an embodiment, step 201 may include preparing reaction buffer for the synthesis. The solution may include 82 mg / mL sodium ascorbate in water with pH>5. The PSMA I&T precursor may be dissolved in reaction buffer as shown in step 202. For example, 1000 μg to 5000 μg of precursor may be used in the reaction depending on the batch size.

[0268] In an embodiment, the amount of [177Lu]LuCl3 used in radiolabeling, step 204, can range from 50 mCi up to 15,200 mCi. The corresponding amount of PSMA I&T used during radiolabeling can range from 0.1 to 0.9 μg / mCi. For example, 15,000 mCi of [177Lu]LuCl3 and 4200 μg of PSMA I&T are added to the reactor during radiolabeling.

[0269] In an embodiment, step 203 may include preparing an ascorbic acid solution (dilution buffer). In some examples, the ascorbic acid solution may be a 33 mg / ml ascorbic acid solution. The solution pH may be adjusted to 4.25±0.05, 4.25±0.10, 4.25±0.15, 4.25±0.20, or 4.25±0.25. For example, the ascorbic acid solution may include 33 mg / ml ascorbic acid / sodium ascorbate at pH 4.25±0.25 and 0.1 mg / ml DTPA.

[0270] In an embodiment, step 204 may include preparing 177Lu. In some embodiments, 177Lu may be provided in HCl. [177Lu]LuCl3 may be provided in 0.05 M HCl. For example, 2 Ci / ml of 177Lu may be provided in 0.05 M HCl. [177Lu]LuCl3 in 0.05 M hydrochloric acid may be transferred into the reactor and the [177Lu]LuCl3 vial may be rinsed with an additional required volume of 82 mg / mL sodium ascorbate (prepared in step 201) that is also then transferred into the reactor.

[0271] The reaction volume may range from 8 ml to 15 ml. The volume may be dependent on the amount of [177Lu]LuCl3 used in the radiolabeling reaction.

[0272] In an embodiment, step 204 may include radiolabeling the PSMA-I&T with 177Lu. The reaction mixture may be heated up to about 70° C., up to about 75° C., up to about 80° C., up to about 85° C., up to about 90° C., or up to about 95° C. In an example, the setpoint for heating is 85° C. and the actual maximum temperature reached is about 75° C. The reaction volume may be heated for up to 5 minutes, up to 10 minutes, up to 15 minutes, up to 20 minutes, up to 25 minutes, up to 30 minutes, up to 35 minutes, up to 40 minutes, or up to 45 minutes. In at least one example, the reaction mixture is heated at setpoint of 80° C. for 10 minutes. In at least one additional example, the reaction mixture is heated at a setpoint of 70° C. for 10 minutes.

[0273] Presumably the stability enhancing conditions, such as ascorbic acid solution at pH of about 5 or below, should preferably be applied as early as possible in the process. For example, ascorbic acid solutions at pH 5 or below may be used instead of water at step 205 to minimize radiolytic damage.

[0274] The final composition may be formulated as a solution suitable for injection. The product is diluted to a standard radioactivity concentration, and therefore, the final volume of the bulk composition varies depending on the starting radioactivity of 177Lu introduced.

[0275] In some embodiments, at step 206 the final composition may be sterile filtered. The sterile filter may be a 0.22 μm sterile filter. The final product may be dispensed through a 0.22 μm sterile filter into single dose vials containing suitable volume and radioactivity referenced to the prescribed calibration time. For example, the final composition may be dispensed through a 0.22 μm sterile filter under a Class A environment into doses containing suitable volume and radioactivity at a calibration time.

[0276] FIG. 3B provides one example of the process of making a radiopharmaceutical composition without purification and without ethanol.

[0277] Provided herein are methods for increasing the shelf life of a radiopharmaceutical product comprising 177Lu-PSMA I&T. The methods may include adjusting the pH of the composition to 4.0, 4.25, 4.5, or 4.75 by adjusting the amount of ascorbic acid in the composition, and / or adjusting the radioactivity to increase the shelf life of the composition by 0.25, 0.5, 0.75, 1, 1.25, 1.5, 2, 2.25, 2.5, 2.75, or 3 days. For example, the radiopharmaceutical composition may have a shelf life of 1, 1.5, 2, 2.25, 2.5, 2.75, 3, 3.25, 3.5, 3.75, or 4 days. In an embodiment, adjusting the pH, radioactivity, and / or ascorbic acid may increase the radiochemical purity of the composition to at least 99%, at least 98.5%, at least 98%, at least 97.5%, at least 97%, at least 96.5%, at least 96%, at least 95.5%, or at least 95% for up to 1, 1.5, 2, 2.25, 2.5, 2.75, 3, 3.25, 3.5, 3.75, 4 days.V. Stability

[0278] A stable non-radioactive labelled standard may be used for identifying the product peak in the HPLC analysis. The formulation may be prepared from an injection grade solution containing ascorbic acid, chelating agent (EDTA, DTPA, or combination thereof), optionally dehydrated ethanol, and injections grade water. The formulation matrix may be prepared ex tempore as part of the synthesis preparation and a predetermined amount is added to the bulk vial as part of the synthesis preparations.

[0279] Without being limited to any one theory, the radioactivity, the amount of ascorbic acid, and / or the pH of the solution may have an impact on the shelf life of the composition. Surprisingly, a lower concentration of ascorbic acid (e.g. 31 mg / ml vs. 42.5 mg / ml) in the composition, a pH 4.5 or lower, a low RAC, and / or the combinations thereof may result in a higher stability profile and a longer shelf life for the composition as compared to compositions with a pH 5 or higher, a high RAC, and / or combinations thereof. For example, this may be seen in FIG. 5. The shelf life may generally be determined based on the radiochemical purity of the composition after formulation or at the time of expiration of the composition. The radiochemical purity may be confirmed by HPLC.

[0280] In one or more embodiments, 177Lu-PSMA I&T formulation compositions with 31 mg / ml of ascorbic acid and pH of about 4.5 in a dose formulation at radioactivity concentration of 640 MBq / ml or below, can provide adequate stability of four days.

[0281] In an embodiment the composition has a low radioactivity concentration (e.g., 588.5 MBq / ml), a pH of 4.5, and 31 mg / ml ascorbic acid has 99.1% radiochemical purity 0 hours post EOS, 98.7% radiochemical purity 20 hours post EOS, 98.0% radiochemical purity 44 hours post EOS, 97.4% radiochemical purity 69 hours post EOS, and 97.0% radiochemical purity 93 hours post EOS. A composition having a low radioactivity concentration (e.g., 626 MBq / ml), a pH of 5.0, and 31 mg / ml ascorbic acid has 99.2% radiochemical purity 0 ours post EOS, 98.4% radiochemical purity 25 hours post EOS, 97.3% radiochemical purity 47 hours post EOS, and 96.5% radiochemical purity 71 hours post EOS. A composition having a low radioactivity concentration (e.g. 579 MBq / ml), a pH of 4.5, and 21 mg / ml ascorbic acid has 99.4% radiochemical purity 0 ours post EOS, 98.3% radiochemical purity 19 hours post EOS, 97.5% radiochemical purity 46 hours post EOS, 96.8% radiochemical purity 71 hours post EOS, and 96.0% radiochemical purity 92 hours post EOS. A composition having a high radioactivity concentration (e.g., 1,278 MBq / ml), a pH of 4.5, and 42.5 mg / ml ascorbic acid has 99.4% radiochemical purity 0 hours post EOS, 98.0% radiochemical purity 24 hours post EOS, 96.7% radiochemical purity 46 hours post EOS, 95.3% radiochemical purity 67 hours post EOS, and 95.2% radiochemical purity 71 hours post EOS.

[0282] The radiopharmaceutical composition may be stored at temperatures ranging from 2° C. to 40° C., about 2° C. to 5° C., about 5° C. to 10° C., about 10° C. to 15° C., about 15° C. to 20° C., about 20° C. to 25° C., about 25° C. to 30° C., about 30° C. to 35° C., or about 35° C. to 40° C.

[0283] In an embodiment, the radiopharmaceutical composition is stored at a temperature from about 5° C. to 40° C., about 10° C. to 35° C. or about 20° C. to 30° C. In one specific embodiment, the radiopharmaceutical composition is stored at a temperature at about 10° C., about 15° C., about 22° C., about 22.5° C., about 25° C., or at room temperature.

[0284] In one embodiment, the radiopharmaceutical composition is stored at about 22.5° C. In another embodiment, the radiopharmaceutical composition is stored at room temperature.VI. Specific Radiopharmaceutical Composition

[0285] In some embodiments, the medicinal product is a sterile filtered radiopharmaceutical solution containing a micro dose of [177Lu]Lu-PSMA I&T solution in a 42.5 mg / ml aqueous ascorbic acid solution containing 7.5% (v / v) or 59 mg / ml ethanol. The product is diluted to a standard radioactivity concentration and therefore the final volume of the bulk product varies depending on the starting radioactivity introduced. The composition of the final product described in Table 1B (177Lu-PSMA I&T composition 1):TABLE 1BComposition of Final Producta (177Lu-PSMA I&T composition 1)ComponentQuantityFunction177Lu-PSMA I&Tq.s.bAPIPSMA I&T5-12μg / mlPrecursorEthanol7.5% (v / v)Stabilizing agent(radiolysis)Ascorbic acid42.5mgStabilizing agent(radiolysis)Disodium EDTA21μgMetal scavengerSodium bicarbonate*q.s.pH adjusterSodium hydroxide*q.s.pH adjusterWFI (injectionsad 1 mlVehiclegrade water)aMax volume per vial is 10 mlbsufficient amount of radioactivity for intended use

[0286] In yet another embodiment, the medicinal product is a sterile filtered radiopharmaceutical solution containing a micro dose of 177Lu-PSMA I&T solution in 31 mg / ml aqueous ascorbic acid solution containing 3.8% (v / v) or 30 mg / ml ethanol, at pH of about 4.5. The product is diluted to a standard radioactivity concentration, and therefore, the final volume of the bulk product varies depending on the starting radioactivity introduced. The composition is described below in Table 1C (177Lu-PSMA I&T composition 2):TABLE 1CComposition of Final Product*([177Lu]Lu-PSMA I&T Composition 2)ComponentQuantityFunction177Lu-PSMA I&Tq.s.**APIPSMA I&T45-120μgEthanol3.8% (v / v)Stabilizing agent(radiolysis)Ascorbic acid31mg / mlStabilizing agent(radiolysis)Disodium EDTA15.5μgMetal scavengerSodium bicarbonateq.spH adjusterSodium hydroxideq.spH adjusterHydrochloric acidq.spH adjusterWFI (injectionsad 1 mlVehiclegrade water)*Max volume per vial is 20 ml**sufficient amount of radioactivity for intended use

[0287] In yet another embodiment, the medicinal product is a radiopharmaceutical solution containing a small amount of [177Lu]Lu-PSMA I&T solution in 28-38 mg / ml aqueous ascorbic acid solution, at pH of about 4.25. The product is diluted to a standard radioactivity concentration, and therefore, the final volume of the bulk product varies depending on the starting radioactivity introduced. The composition is described below in Table 1D (177Lu-PSMA I&T composition 3):TABLE 1DComposition of Final Product* (177Lu-PSMA I&T composition 3)ComponentQuantityFunction177Lu-PSMA I&Tq.s.**APIPSMA I&T45-120μgAscorbic acid420-570mgStabilizing agent(radiolysis)DTPA0.075-0.15mg / mlMetal ion chelatorWFI (injectionsad 1 mlVehiclegrade water)*Max volume per vial is 15 ml**sufficient amount of radioactivity for intended use

[0288] In yet another embodiment, the medicinal product has the composition described below in Table 1E (177Lu-PSMA I&T composition 4):TABLE 1EComposition of Final Product* (177Lu-PSMA I&T composition 4)ComponentQuantity per mLLu-177-PSMA I&T0.5 GBq (13.5 mCi)Lu-177-PSMA I&T<6μgand PSMA I&TAscorbic acid31 mg (15-35)Hydrochloric AcidSufficient to adjustpH to 4.0 to 5.0Sodium BicarbonateA sufficient quantityNaOHA sufficient quantityDisodium EDTA10.5μgEthanol37.5 μL (29.5 mg)(2.5-4.5% (v / v))Water forSufficient to make 1 mLInjection

[0289] Disodium EDTA is present as an excipient in the ascorbic acid solution used during formulation at a strength of 0.25 mg / 500 mg of ascorbic acid along with sufficient amounts of NaOH and NaHCO3 to control ascorbic acid pH; neither Disodium EDTA, NaOH or NaHCO3 is controlled or added to the Lu-177-PSMA I&T injection as a separate ingredient, but is present in the Lu-177-PSMA I&T Injection as a result of the addition of the ascorbic acid solution containing these excipients.VII. Formulating the Drug Product

[0290] The drug product may be delivered in a sterile pyrogen free glass vial of Type 1 glass with a fluorocoated bromobutyl rubber septum. The septum is sealed with a crimped aluminum seal. During transportation, the glass vial containing the radiopharmaceutical is kept in a lead shielded container. The transport container including lead shield and outer packaging complies to type A requirements (IAEA standards). FIG. 4 depicts a drawing of a product vial that can be used in this embodiment.

[0291] In one embodiment, the volume of the solution comprising the formulation or radiopharmaceutical composition is from about 10 ml to about 20 ml, from about 20 ml to about 30 ml, from about 30 ml to about 40 ml, from about 40 ml to about 50 ml, from about 50 ml to about 60 ml, from about 60 ml to about 70 ml, from about 70 ml to about 80 ml, from about 80 ml to about 90 ml, or from about 90 ml to about 100 ml. In one specific embodiment, the volume of the solution comprising the formulation or radiopharmaceutical composition is about 1 ml, about 5 ml, about 7 ml, about 8 ml, about 9 ml, about 10 ml, about 15 ml, about 20 ml, about 25 ml, or about 30 ml. In one embodiment, the volume of the solution comprising the formulation or radiopharmaceutical composition is from about 11 ml, about 12 ml, about 13 ml, about 14 ml, about 15 ml, about 16 ml, about 17 ml, about 18 ml, about 19 ml, about 20 ml, about 25 ml, or about 30 ml.

[0292] In one embodiment, the volume of the solution comprising the formulation or radiopharmaceutical composition is from about 100 ml to about 200 ml, from about 200 ml to about 300 ml, from about 300 ml to about 400 ml, from about 400 ml to about 500 ml, from about 500 ml to about 600 ml, from about 600 ml to about 700 ml, from about 700 ml to about 800 ml, from about 800 ml to about 900 ml, or from about 900 ml to about 1000 ml. In one specific embodiment, the volume of the solution comprising the formulation or radiopharmaceutical composition is about 200 ml, about 225 ml, about 250 ml, about 275 ml, about 300 ml, about 325 ml, about 350 ml, about 375 ml, about 400 ml, about 425 ml, about 450 ml, about 475 ml, about 500 ml, about 525 ml, about 550 ml, about 575 ml, about 600 ml, about 625 ml, about 650 ml, about 675 ml, about 700 ml, about 725 ml or about 750 ml.

[0293] In one specific embodiment, the final volume in the dose vial is adjusted to between 7 ml and 10 ml, between 10 ml and 15 ml, or between 15 ml and 20 ml in order to provide the required amount of radioactivity at the date and time of infusion.

[0294] In another embodiment, 177Lu-PSMA I&T injection is supplied as a single-dose vial or multi-dose vial. For example, provided herein is a radiopharmaceutical kit including a vial comprising a single dose of the 177Lu-PSMA I&T injection product composition. In one embodiment, the strength of the 177Lu-PSMA I&T injection product composition is about 0.1 GBq / ml, about 0.2 GBq / ml, about 0.3 GBq / ml, about 0.4 GBq / ml, about 0.5 GBq / ml, about 0.6 GBq / ml, about 0.7 GBq / ml, about 0.8 GBq / ml, about 0.9 GBq / ml, about 1.0 GBq / ml, about 1.1 GBq / ml, about 1.2 GBq / ml, about 1.3 GBq / ml, about 1.4 GBq / ml, about 1.5 GBq / ml, about 1.6 GBq / ml, about 1.7 GBq / ml, about 1.8 GBq / ml, about 1.9 GBq / ml, or about 2.0 GBq / ml. In another embodiment, the strength of the 177Lu-PSMA I&T injection product composition is less than about 2.0 GBq / ml, less than about 1.5 GBq / ml, less than about 1.0 GBq / ml, or less than about 0.5 GBq / ml.

[0295] In yet another embodiment, the shelf life of the [177Lu]Lu-PSMA I&T injection product composition is from about 30 hours to about 90 hours, from about 40 hours to about 80 hours, or from about 48 hours to about 72 hours. In one specific embodiment, the shelf life of the [177Lu]Lu-PSMA I&T injection product composition is about 30 hours, about 35 hours, about 40 hours, about 45 hours, about 48 hours, about 50 hours, about 55 hours, about 60 hours, about 65 hours, about 70 hours, about 72 hours, about 75 hours, about 80 hours, about 85 hours, or about 90 hours.

[0296] In some embodiments, the radiopharmaceutical composition should have a radiochemical purity of ≥95% for [177Lu]Lu-PSMA I&T to be sufficient for administration to a patient. The combined radiochemical impurities in the composition may be <5%. In various embodiments, the radiopharmaceutical composition may have a chemical purity such that Lu-PSMA I&T is present in the composition in a concentration of less than about 12 μg / ml, less than about 11 μg / ml, less than about 10 μg / ml, less than about 9 μg / ml, less than about 8 μg / ml, less than about 7 μg / ml, less than about 6 μg / ml, less than about 5 μg / ml, less than about 4 μg / ml, less than about 3 μg / ml, less than about 2 μg / ml, less than about 1.75 μg / ml, less than about 1.5 μg / ml, or less than about 1 μg / ml.

[0297] In some embodiments, the radiopharmaceutical composition may have an amount of colloidal 177Lu of less than about 5% of radioactivity, less than about 4.5% of radioactivity, less than about 4% of radioactivity, less than about 3.5% of radioactivity, less than about 3% of radioactivity, less than about 2.5% of radioactivity, less than about 2% of radioactivity, less than about 1.5% of radioactivity, less than about 1% of radioactivity, less than about 0.5% of radioactivity, less than about 0.3% of radioactivity, less than about 0.2% of radioactivity, or less than about 0.1% of radioactivity In one embodiment, the radiopharmaceutical composition administered to the human patient in need thereof comprises less than 0.5%, less than 0.4%, less than 0.3%, less than 0.2%, or less than 0.1% colloidal 177Lu.

[0298] In some embodiments, the radiopharmaceutical composition may have less than about 17.5 EU / ml, less than about 17 EU / ml, less than about 16.5 EU / ml, less than about 16 EU / ml, less than about 15.5 EU / ml, less than about 15 EU / ml, less than about 14.5 EU / ml, less than about 14 EU / ml less than about 13.5 EU / ml, less than about 13 EU / ml, less than about 12.5 EU / ml, less than about 12 EU / ml, less than about 11.5 EU / ml, less than about 11 EU / ml, less than about 10.5 EU / ml, less than about 10 EU / ml, less than about 9.5 EU / ml, less than about 9 EU / ml, less than about 8.5 EU / ml, less than about 8 EU / ml, less than about 7.5 EU / ml, less than about 7 EU / ml, less than about 6.5 EU / ml, less than about 6 EU / ml, less than about 5.5 EU / ml, less than about 5 EU / ml, less than about 4.5 EU / ml, less than about 4 EU / ml, less than about 3.5 EU / ml, less than about 3 EU / ml, less than about 2.5 EU / ml, less than about 2 EU / ml, less than about 1.5 EU / ml, less than about 1 EU / ml, less than about 0.5 EU / ml, or no bacterial endotoxins.

[0299] In an embodiment, the radiochemical purity of the composition is ≥95% at 1 day, up to 2 days, up to 3 days, up to 4 days, or up to 5 days after formulation. In additional embodiments, the radiochemical purity of the composition is ≥95% at 24 hours, up to 36 hours, up to 48 hours, up to 72 hours, or up to 96 hours after formulation. In further embodiments, the radiochemical purity of the composition is suitable for injection and suitable for administration to a patient in need thereof more than 72 hours after formulation, more than 96 hours after formulation, or more than 100 hours after formulation. The radiopharmaceutical composition may have a radiochemical purity of at least 95%, at least 95.5%, at least 96%, at least 96.5%, at least 97%, at least 97.5%, at least 98%, at least 98.5%, or at least 99% at 24 hours, 48 hours, 72 hours, and / or 96 hours after formulation. In some examples, the radiopharmaceutical composition may have a radiochemical purity of 95.0% or greater, 95.5% or greater, 96.0% or greater, 96.5% or greater, 97.0% or greater, 97.5% or greater, 98.0% or greater, 98.5% or greater, 99.0% or greater, or 99.5% or greater at administration. For example, the radiopharmaceutical composition may have a radiochemical purity of more than 95% at 46 to 48 hours after formulation, a radiochemical purity of more than 96% at 46 to 48 hours after formulation, a radiochemical purity of more than 97% at 46 to 48 hours after formulation, a radiochemical purity of more than 95% at 69 to 72 hours after formulation, a radiochemical purity of more than 96% at 69 to 72 hours after formulation, a radiochemical purity of more than 97% at 69 to 72 hours after formulation, a radiochemical purity of more than 95% at 90 to 93 hours after formulation, a radiochemical purity of more than 96% at 90 to 93 hours after formulation, and / or a radiochemical purity of more than 97% at 90 to 93 hours after formulation.

[0300] In some examples, the radiochemical purity of the composition may range from about 99.0% to about 99.4% 0 hours post EOS. In various embodiments, the radiochemical purity of the composition may range from about 96.5% to about 98.7% 19-25 hours post EOS. In other examples, the radiochemical purity of the composition may range from about 93.3% to about 98.0% 44-47 hours post EOS. In additional examples, the radiochemical purity of the composition may range from about 91.2% to about 97.4% 69-71 hours post EOS. In some examples, the radiochemical purity of the composition may range from about 95% to about 97.0% 90-93 hours post EOS.

[0301] In another embodiment, [177Lu]Lu-PSMA I&T injection is supplied as a single-dose vial or multi-dose vial.

[0302] In yet another embodiment, a patient in need of radioligand therapy during a treatment receives a single intravenous radioactive dose at the beginning of a treatment cycle. The treatment cycle is from 1 to 10 weeks. In one embodiment, the treatment includes 1 to 6 treatment cycles. In another embodiment, a dose reduction or a dose increase is introduced during treatment.

[0303] In one embodiment, the volume of the patient dose is calculated depending on the radioactive dose to be administered.

[0304] In another embodiment, [177Lu]Lu-PSMA I&T is infused by intravenous (IV) route slowly, over about 10 minutes, and followed by infusion of 500-1000 mL of Ringer's or normal saline solution. An extra 7 mL injection when the total blood volume is over 5,000 mL is of no consequence. The dose is administered every 6 weeks for 4 cycles.

[0305] In yet another embodiment, a patient in need of radioligand therapy during a treatment receives a single intravenous radioactive dose at the beginning of a treatment cycle. The treatment cycle is from 1 to 10 weeks. In one embodiment, the treatment includes 1-6 treatment cycles. In another embodiment, a dose reduction or a dose increase is introduced during treatment.

[0306] In one embodiment, the volume of the patient dose is calculated depending on the radioactive dose to be administered.VIII. Method of Diagnosing or Treatment of Prostate Cancer

[0307] Provided herein are methods of diagnosing or treating a tumor of a patient in need thereof. The method may include administering by injection a radiopharmaceutical composition comprising 177Lu-PSMA I&T and ascorbic acid at a pH of 3.5 to 4.5 in solution.

[0308] In some embodiments, the mean absorbed dose of the radiopharmaceutical composition may be about 0.1 mGy / MBq to 0.5 mGy / MBq, about 0.5 mGy / MBq to 1.0 mGy / MBq, 0.5 mGy / MBq to 0.6 mGy / MBq, 0.6 mGy / MBq to 0.7 mGy / MBq, 0.7 mGy / MBq to 0.8 mGy / MBq, 0.8 mGy / MBq to 0.9 mGy / MBq, 0.9 mGy / MBq to 1.0 mGy / MBq, 1 mGy / MBq to 1.5 mGy / MBq, 1.0 mGy / MBq to 1.1 mGy / MBq, 1.1 mGy / MBq to 1.2 mGy / MBq, 1.2 mGy / MBq to 1.3 mGy / MBq, 1.3 mGy / MBq to 1.4 mGy / MBq, or 1.4 mGy / MBq to 1.5 mGy / MBq, 1.5 mGy / MBq to 2.5 mGy / MBq, 2.5 mGy / MBq to 3.5 mGy / MBq, 2.5 mGy / MBq to 2.7 mGy / MBq, 2.7 mGy / MBq to 2.9 mGy / MBq, 2.9 mGy / MBq to 3.1 mGy / MBq, 3.1 mGy / MBq to 3.3 mGy / MBq, 3.3 mGy / MBq to 3.5 mGy / MBq, or 3.5 mGy / MBq to 4.5 mGy / MBq in the kidneys of the patient. In some embodiments, the mean absorbed dose of the radiopharmaceutical composition may be about 1 mGy / MBq to 1.5 mGy / MBq, 1.0 mGy / MBq to 1.1 mGy / MBq, 1.1 mGy / MBq to 1.2 mGy / MBq, 1.2 mGy / MBq to 1.3 mGy / MBq, 1.3 mGy / MBq to 1.4 mGy / MBq, or 1.4 mGy / MBq to 1.5 mGy / MBq in the parotid glands of the patient. In some embodiments, the mean absorbed dose of the radiopharmaceutical composition may be about 2.5 mGy / MBq to 3.5 mGy / MBq, 2.5 mGy / MBq to 2.7 mGy / MBq, 2.7 mGy / MBq to 2.9 mGy / MBq, 2.9 mGy / MBq to 3.1 mGy / MBq, 3.1 mGy / MBq to 3.3 mGy / MBq, or 3.3 mGy / MBq to 3.5 mGy / MBq in bone lesions of the patient. In some embodiments, the mean absorbed dose of the radiopharmaceutical composition may be about 3.5 mGy / MBq to 4.5 mGy / MBq, 3.5 mGy / MBq to 3.7 mGy / MBq, 3.7 mGy / MBq to 3.9 mGy / MBq, 3.9 mGy / MBq to 4.1 mGy / MBq, 4.1 mGy / MBq to 4.3 mGy / MBq, or 4.3 mGy / MBq to 4.5 mGy / MBq in lymph node lesions of the patient.

[0309] Treatment aimed at eradicating the primary tumor, typically with surgery or radiation, is unsuccessful in ˜30% of men, who develop recurrent disease that usually manifests first as a rise in plasma prostate-specific antigen (PSA) followed by metastasis to distant sites (Stephenson et al. J Clin Oncol, 2005; 23:8253-61). Given that prostate cancer cells depend on androgen receptors (AR) for their proliferation and survival, the standard treatment for patients with recurrent disease is androgen deprivation therapy (ADT) with a gonadotropin releasing hormone analog (GnRHa)) with or without an anti-androgen.

[0310] Treatment results with ADT are generally predictable: a decline in PSA followed by tumor regression, a period of stability in which the tumor does not proliferate and stable PSA, followed by rising PSA and regrowth defined as a castration-resistant disease. Nearly all men with progressive prostate cancer eventually develop castration-resistant disease. Prostate cancer progression despite castrate levels of testosterone represents a transition to a lethal disease stage. Docetaxel with prednisone, cabazitaxel with prednisone, enzalutamide, and abiraterone with prednisone have become the Standard of Care based on the National Comprehensive Cancer Network (NCCN) guidelines (Mohler et al., NCCN Clinical practice guidelines in oncology. Prostate Cancer, (Version 2.2019). JNCCN.org; 17 (5), 479-505) in men with metastatic castration-resistant prostate cancer (mCRPC).

[0311] Abiraterone, enzalutamide, and docetaxel with prednisone are all indicated for patients with mCRPC as first line of treatment, while cabazitaxel with prednisone is indicated only for mCRPC patients who progressed on docetaxel. George et al. reported the sequencing of treatments for mCRPC patients in a real-world clinical setting in the United States (George et al. 2020). A higher proportion of patients in the US receive androgen receptor axis-targeted therapy (ARAT, namely abiraterone and enzalutamide) as a first line treatment versus docetaxel; similarly, a higher proportion of mCRPC patients receive the alternative ARAT as second line of treatment (enzalutamide after abiraterone, or vice versa).

[0312] Targeted radionuclide therapy is an emerging therapy option for many different cancers, including lymphoma, melanoma, and neuroendocrine tumors (Kraeber-Bodéré et al., Semin Oncol, 2014, 41, 613-22; Mier et al., J Nucl Med, 2014, 55, 9-14; Bodei et al., Eur J Nucl Med Mol Imaging, 2015, 42, 5-19). Prostate-specific membrane antigen (PSMA) is a key target for radionuclide diagnosis and therapy for PC. PSMA is normally expressed in prostate cells as well as some extraprostatic tissue but its overexpression in prostate cancer cells makes it an attractive target for therapeutic agents with the potential to limit systemic toxicity (Silver et al, Clin Cancer Res. 1997 January; 3 (1): 81-5. PMID: 9815541). Initial clinical experience with PSMA-based radionuclide treatment of PC using 131I-labeled PSMA showed promising results with a PSA decrease >50% in 60% of all treated prostate cancer patients and with mild hematotoxicity (Zechmann et al., Eur J Nucl Med Mol Imaging, 2014, 41, 1280-92).IX. Administration

[0313] Further provided herein are methods of administering the radiopharmaceutical composition. The radiopharmaceutical composition may be administered by injection or infusion to a human patient in need thereof.

[0314] There can be about six main aspects of administration.

[0315] First, cooling the salivary glands, the patients receive ice packs over the parotid and submandibular glands from 30 min prior to and up to 4 hours after administration of 177Lu-PSMA I&T to reduce the risk of salivary gland radiation injuries. There is no scientific evidence of whether cooling the salivary glands is an effective therapy for saving these glands from radiation; however, it is tolerable and not harmful for the patients.

[0316] Second, using a urinary catheter in incontinent patients in the first 48 hours to avoid any contamination.

[0317] Third, activity of 6.5-7.5 GBq (range: 6.0-8.0 GBq) 177Lu-PSMA I&T. The amount of activity can be reduced to 4.0-5.0 GBq in the case of impaired renal function (e.g., Creatinine within 1.0-1.5 UNL). According to the preliminary results, an activity of 7.4 GBq can be administered safely; however, more data are required to increase the amount of activity.

[0318] Fourth, infusion of the activity intravenously as a slow bolus (over about 1-15 minutes) followed by 500-1000 ml Ringer or NaCl solution. The patients should be encouraged to void as frequently as possible and drink about 2 liters of water daily. In patients with dilated non-obstructive renal disease an administration of diuretics may be meaningful.

[0319] Fifth, in average 3-5 cycles of the RLT every 5-8 weeks, experience up to 11 cycles has been reported. In the case of continuously increasing PSA, after the first two cycles accompanied by worsening of the general condition, the indication of further RLTs should be re-evaluated. In case of a decreasing PSA to <1.0 μg / l during the therapy cycles, a PSMA imaging could evaluate existence of small PSMA-positive metastases after completion of RLT when post injection SPECT study is not enough informative. In case of a significant decline of platelets or leukocytes, the time interval between the 2 cycles can be prolonged.

[0320] Sixth, at least one whole body scan 24-48 hours post injection (preferably with SPECT ( / CT). In patients with diffuse bone and bone marrow metastases as well as in patients with brain metastases a concomitant corticosteroid therapy (e.g., prednisolone 20 mg / daily) in the first two weeks after administration is advisable.

[0321] In some embodiments, the method may include injecting the radiopharmaceutical composition into a patient in need thereof more than 48 hours after formulation. In some examples, the radiopharmaceutical composition may include 177Lu-PSMA I&T and ascorbic acid in a solution having a pH of 3.5 to 4.5, and the solution may have a radiochemical purity of more than 96% when administered. In an embodiment, the pH of the solution is about 3.5 to 4.2. The composition may include <6 μg / ml of Lu-PSMA I&T, about 7 μg / ml to about 18 μg / ml disodium EDTA, about 25 μl / ml to about 45 μl / ml ethanol, and / or about 15 to about 35 mg / ml ascorbic acid. The composition may have a radioactivity of about 0.5 GBq / ml or about 13.5 mCi / ml and have a radiochemical purity of at least 98% at 44 hours after formulation, at least 97% at 69 hours after formulation, and / or at least 97% at 93 hours after formulation.

[0322] The pharmaceutical composition may be administered as 2-11 cycles / treatments every 5-8 weeks. In some embodiments, the patient may be administered up to 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, or 11 treatments and the treatments may be administered every 4, 5, 6, 7, or 8 weeks. In an example, the patient may be administered up to 4 treatments, with each treatment administered every 6 weeks.

[0323] In various embodiments, the patient may be administered 177Lu-PSMA I&T at a dose of 0.5 GBq to 10 GBq per dose cycle. For example, the radiopharmaceutical composition may contain a standard radioactivity of about 200 mCi at the time of administration with a standard radioactivity concentration of about 27 mCi / mL at end of production; therefore, the final volume of the dose vial may be adjusted to between 7 and 15 mL in order to provide the required amount of radioactivity at the date and time of infusion. In some embodiments, the dose vial contains between 10 to 20 mL. In at least one example, the patient may be administered a dose of about 200 mCi (7.4 GBq±0.1 GBq) for each treatment. In one aspect, the patient may be administered a dose of about 200 mCi (7.4 GBq±0.1 GBq) for each treatment for four, five, six, seven, or more treatments. In another aspect, the patient may be administered a dose of about 200 mCi (7.4 GBq±0.1 GBq) for each treatment for four or more treatments, five or more, six or more, seven or more, or eight or more treatments. In yet another aspect, the patient may be administered a dose of about 200 mCi (≥7.1 GBq) for each treatment for four, five, six, seven, eight, or more treatments. In another example, the patient may be administered a dose of about 6.8 GBq±0.3 GBq for each treatment. In one aspect, the patient may be administered a dose of about 6.8 GBq±0.3 GBq for each treatment for four, five, six, seven, eight or more treatments.

[0324] In various embodiments, the patient may be administered 177Lu-PSMA I&T at a dose of about 0.5 GBq to about 10 GBq, about 1.0 GBq to about 9.0 GBq, about 1.5 GBq to about 8.5 GBq, about 2.0 GBq to about 8.0 GBq, about 2.5 GBq to about 7.5 GBq, or about 3.0 GBq to about 7.0 GBq, wherein the total cumulative dose to the patient's kidneys per each administration is ≤3.9 Gy, ≤3.8 Gy, ≤3.7 Gy, ≤3.6 Gy, ≤3.5 Gy, ≤3.4 Gy, ≤3.3 Gy, ≤3.2 Gy, ≤3.1 Gy, ≤3.0 Gy, ≤2.9 Gy, ≤2.8 Gy, ≤2.7 Gy, ≤2.6 Gy, ≤2.5 Gy, or ≤2.4 Gy, and wherein the patient may be administered a dose for each treatment for one, two, three, four, five, six, seven, eight, or more treatments (i.e., cycles of treatment). for four, five, six, seven, eight, or more treatments (i.e., cycles of treatment). In various embodiments, the patient may be administered 177Lu-PSMA I&T at a dose of about 0.5 GBq to about 10.0 GBq, about 0.5 GBq to about 9.5 GBq, about 0.5 GBq to about 9.0 GBq, about 0.5 GBq to about 8.5 GBq, about 0.5 GBq to about 8.0 GBq, about 0.5 GBq to about 7.5 GBq, about 1.0 GBq to about 10.0 GBq, about 1.0 GBq to about 9.5 GBq, about 1.0 GBq to about 9.0 GBq, about 1.0 GBq to about 8.5 GBq, about 1.0 GBq to about 1.0 GBq, about 1.0 GBq to about 7.5 GBq, about 1.5 GBq to about 10.0 GBq, about 1.5 GBq to about 9.5 GBq, about 1.5 GBq to about 9.0 GBq, about 1.5 GBq to about 8.5 GBq, about 1.5 GBq to about 8.0 GBq, about 1.5 GBq to about 7.5 GBq, about 2.0 GBq to about 10.0 GBq, about 2.0 GBq to about 9.5 GBq, about 2.0 GBq to about 9.0 GBq, about 2.0 GBq to about 8.5 GBq, about 2.0 GBq to about 8.0 GBq, about 2.5 GBq to about 10.0 GBq, about 2.5 GBq to about 2.5 GBq, about 2.5 GBq to about 9.0 GBq, about 2.5 GBq to about 8.5 GBq, about 2.5 GBq to about 8.0 GBq, about 2.5 GBq to about 7.5 GBq, about 3.0 GBq to about 10.0 GBq, about 3.0 GBq to about 9.5 GBq, about 3.0 GBq to about 9.0 GBq, about 3.0 GBq to about 8.5 GBq, about 3.0 GBq to about 8.0 GBq, about 3.0 GBq to about 7.5 GBq, about 3.5 GBq to about 10.0 GBq, about 3.5 GBq to about 9.5 GBq, about 3.5 GBq to about 9.0 GBq, about 3.5 GBq to about 8.5 GBq, about 3.5 GBq to about 8.0 GBq, about 3.5 GBq to about 7.5 GBq, about 0.5 GBq to about 7.5 GBq, about 0.5 GBq to about 7.4 GBq, about 1.0 GBq to about 7.4 GBq, about 1.5 GBq to about 7.4 GBq, about 2.0 GBq to about 7.4 GBq, about 2.5 GBq to about 7.4 GBq, about 3.0 GBq to about 7.4 GBq, about 3.5 GBq to about 7.4 GBq, about 4.0 GBq to about 7.4 GBq, about 4.5 GBq to about 7.4 GBq, about 5.0 GBq to about 7.4 GBq, about 5.5 GBq to about 7.4 GBq, about 6.0 GBq to about 7.4 GBq, about 6.5 GBq to about 7.4 GBq, about 6.6 GBq to about 7.4 GBq, about 6.7 GBq to about 7.4 GBq, about 6.8 GBq to about 7.4 GBq, about 6.9 GBq to about 7.4 GBq, about 7.0 GBq to about 7.4 GBq, about 7.1 GBq to about 7.4 GBq, about 7.2 GBq to about 7.4 GBq, or about 7.3 GBq to about 7.4 GBq, wherein the total cumulative dose to the patient's kidneys per each administration is ≤3.9 Gy, ≤3.8 Gy, ≤3.7 Gy, ≤3.6 Gy, ≤3.5 Gy, ≤3.4 Gy, ≤3.3 Gy, ≤3.2 Gy, ≤3.1 Gy, ≤3.0 Gy, ≤2.9 Gy, ≤2.8 Gy, ≤2.7 Gy, ≤2.6 Gy, ≤2.5 Gy, or ≤2.4 Gy, and wherein the patient may be administered a dose for each treatment for one, two, three, four, five, six, seven, eight, or more treatments (i.e., cycles of treatment). In other various embodiments, the patient may be administered 177Lu-PSMA I&T at a dose of about 0.5 GBq to about 6.8 GBq, about 1.0 GBq to about 6.8 GBq, about 1.5 GBq to about 6.8 GBq, about 2.0 GBq to about 6.8 GBq, about 2.5 GBq to about 6.8 GBq, about 3.0 GBq to about 6.8 GBq, about 3.5 GBq to about 6.8 GBq, about 4.0 GBq to about 6.8 GBq, about 4.5 GBq to about 6.8 GBq, about 5.0 GBq to about 6.8 GBq, about 5.5 GBq to about 6.8 GBq, about 6.0 GBq to about 6.8 GBq, about 6.1 GBq to about 6.8 GBq, about 6.2 GBq to about 6.8 GBq, about 6.3 GBq to about 6.8 GBq, about 6.4 GBq to about 6.8 GBq, about 6.5 GBq to about 6.8 GBq, about 6.6 GBq to about 6.8 GBq, or about 6.7 GBq to about 7.4 GBq, wherein the total cumulative dose to the patient's kidneys per each administration is ≤3.9 Gy, ≤3.8 Gy, ≤3.7 Gy, ≤3.6 Gy, ≤3.5 Gy, ≤3.4 Gy, ≤3.3 Gy, ≤3.2 Gy, ≤3.1 Gy, ≤3.0 Gy, ≤2.9 Gy, ≤2.8 Gy, ≤2.7 Gy, ≤2.6 Gy, ≤2.5 Gy, or ≤2.4 Gy, and wherein the patient may be administered a dose for each treatment for one, two, three, four, five, six, seven, eight, or more treatments (i.e., cycles of treatment).

[0325] In various embodiments, the patient may be administered greater than 10 treatments, and the treatments may be administered every 4, 5, 6, 7, or 8 weeks, so long as the total cumulative dose to the patient's kidneys after all treatments remains below 23 grays (Gy). For example, the patient may be administered greater than 10, greater than 15, greater than 20, greater than 25, greater than 30, greater than 35, greater than 40, greater than 45, greater than 50, greater than 55, greater than 60, greater than 65, greater than 70, or greater than 75 treatments, and the treatments may be administered every 4, 5, 6, 7, or 8 weeks, so long as the total cumulative dose to the patient's kidneys after all treatments remains below 23 grays (Gy).

[0326] In some embodiments, the administration of the [177Lu]Lu-PSMA I&T results in an absorbed dose to the patient's kidneys of 0.46 Gy / GBq±0.23 Gy / GBq (i.e., 0.46 Gy per GBq of the administered 177Lu-PSMA I&T). In some additional embodiments, the administration of the 177Lu-PSMA I&T results in an absorbed dose to the patient's kidneys of less than or equal to 0.46 Gy / GBq.

[0327] In various embodiments, the administration of the [177Lu]Lu-PSMA I&T results in an absorbed dose to the patient's kidneys of 0.43 Gy / GBq±0.05 Gy / GBq (i.e., 0.43 Gy per GBq of the administered [177Lu]Lu-PSMA I&T). In some additional embodiments, the administration of the [177Lu]Lu-PSMA I&T results in an absorbed dose to the patient's kidneys of less than or equal to 0.43 Gy / GBq.

[0328] In other embodiments, the administration of the [177Lu]Lu-PSMA I&T results in an absorbed dose to the patient's kidneys of 0.41 Gy / GBq±0.15 Gy / GBq (i.e., 0.41 Gy per GBq of the administered [177Lu]Lu-PSMA I&T). In some additional embodiments, the administration of the [177Lu]Lu-PSMA I&T results in an absorbed dose to the patient's kidneys of less than or equal to 0.41 Gy / GBq.

[0329] In various embodiments, the administration of the [177Lu]Lu-PSMA I&T results in an absorbed dose to the patient's lacrimal glands of 0.67 Gy / GBq±0.33 Gy / GBq (i.e., 0.67 Gy per GBq of the administered [177Lu]Lu-PSMA I&T). In some additional embodiments, the administration of the [177Lu]Lu-PSMA I&T results in an absorbed dose to the patient's lacrimal glands of less than or equal to 0.67 Gy / GBq.

[0330] In other embodiments, the administration of the [177Lu]Lu-PSMA I&T results in an absorbed dose to the patient's lacrimal glands of 0.40 Gy / GBq±0.37 Gy / GBq (i.e., 0.40 Gy per GBq of the administered [177Lu]Lu-PSMA I&T). In some additional embodiments, the administration of the [177Lu]Lu-PSMA I&T results in an absorbed dose to the patient's lacrimal glands of less than or equal to 0.40 Gy / GBq.

[0331] In other embodiments, the administration of the [177Lu]Lu-PSMA I&T results in an absorbed dose to the patient's salivary glands of 0.10 Gy / GBq±0.06 Gy / GBq (i.e., 0.10 Gy per GBq of the administered [177Lu]Lu-PSMA I&T). In some additional embodiments, the administration of the 177Lu-PSMA I&T results in an absorbed dose to the patient's salivary glands of less than or equal to 0.10 Gy / GBq.

[0332] In various embodiments, the administration of the [177Lu]Lu-PSMA I&T results in an absorbed dose to the patient's salivary glands of 0.13 Gy / GBq±0.08 Gy / GBq (i.e., 0.13 Gy per GBq of the administered [177Lu]Lu-PSMA I&T). In some additional embodiments, the administration of the [177Lu]Lu-PSMA I&T results in an absorbed dose to the patient's salivary glands of less than or equal to 0.13 Gy / GBq.

[0333] In other embodiments, the administration of the [177Lu]Lu-PSMA I&T results in an absorbed dose to the patient's salivary glands of 0.18 Gy / GBq±0.16 Gy / GBq (i.e., 0.18 Gy per GBq of the administered [177Lu]Lu-PSMA I&T). In some additional embodiments, the administration of the [177Lu]Lu-PSMA I&T results in an absorbed dose to the patient's salivary glands of less than or equal to 0.18 Gy / GBq.

[0334] In various embodiments, the administration of the [177Lu]Lu-PSMA I&T results in an absorbed dose to the patient's liver of 0.03 Gy / GBq±0.02 Gy / GBq (i.e., 0.03 Gy per GBq of the administered [177Lu]Lu-PSMA I&T). In some additional embodiments, the administration of the [177Lu]Lu-PSMA I&T results in an absorbed dose to the patient's liver of less than or equal to 0.03 Gy / GBq.

[0335] In other embodiments, the administration of the [177Lu]Lu-PSMA I&T results in an absorbed dose to the patient's liver of 0.04 Gy / GBq±0.02 Gy / GBq (i.e., 0.04 Gy per GBq of the administered 177Lu-PSMA I&T). In some additional embodiments, the administration of the 177Lu-PSMA I&T results in an absorbed dose to the patient's liver of less than or equal to 0.04 Gy / GBq.

[0336] The administration of 177Lu-PSMA I&T may be described as a mathematical formula to ensure that the total cumulative dose to the patient's kidneys after all treatments remains below 23 Gy. An example formula is shown below to determine the number of cycles allowable.X=2⁢3Y*Zwhere X is the total number of cycles allowable at a given activity of 177Lu-PSMA I&T, Y is the activity of each dose of the 177Lu-PSMA I&T, Y is the absorbed dose of radiation in Gy per MBq of the administered 177Lu-PSMA I&T, and Z is the activity of the of the administered 177Lu-PSMA I&T in MBq.In various embodiments, the patient may be administered 1 GBq of 177Lu-PSMA I&T for 53 treatments, 2 GBq of 177Lu-PSMA I&T for 26 treatments, 3 GBq of 177Lu-PSMA I&T for 17 treatments, 4 GBq of 177Lu-PSMA I&T for 13 treatments, 5 GBq of 177Lu-PSMA I&T for 10 treatments, 6 GBq of 177Lu-PSMA I&T for 8 treatments, 7 GBq of 177Lu-PSMA I&T for 7 treatments, 8 GBq of 177Lu-PSMA I&T for 6 treatments, 9 GBq of 177Lu-PSMA I&T for 5 treatments, 10 GBq of 177Lu-PSMA I&T for 5 treatments, etc.

[0338] In various embodiments, the present disclosure is further related to a radiopharmaceutical kit, comprising a vial containing at least a single dose of a 177Lu-PSMA I&T solution for injection to a human patient in need thereof, wherein the injection comprises a 6.5 GBq±0.10 GBq dose, 6.5 GBq±0.15 GBq dose, 6.5 GBq±0.20 GBq dose, 6.5 GBq±0.25 GBq dose, or 6.5 GBq±0.30 GBq dose, and wherein 177Lu-PSMA I&T treatment with 1, 2, 3, 4, 5, 6, or 7 cycles at the dose is possible without the risk of kidney toxicities and / or wherein 177Lu-PSMA I&T treatment with 1, 2, 3, 4, 5, 6, or 7 cycles provides a mean projected dose that is below a cumulative absorbed dose to the kidney of 23 Gy and / or the projected or actual cumulative absorbed dose to the kidneys at 1, 2, 3, 4, 5, 6, or 7 cycles is less than 23 Gy and no renal toxicities are observed.

[0339] In various embodiments, the present disclosure is further related to a radiopharmaceutical kit, comprising a vial containing at least a single dose of a 177Lu-PSMA I&T solution for injection to a human patient in need thereof, wherein the injection comprises a 6.6 GBq±0.10 GBq dose, 6.6 GBq±0.15 GBq dose, 6.6 GBq±0.20 GBq dose, 6.6 GBq±0.25 GBq dose, or 6.6 GBq±0.30 GBq dose, and wherein 177Lu-PSMA I&T treatment with 1, 2, 3, 4, 5, 6, or 7 cycles at the dose is possible without the risk of kidney toxicities and / or wherein 177Lu-PSMA I&T treatment with 1, 2, 3, 4, 5, 6, or 7 cycles provides a mean projected dose that is below a cumulative absorbed dose to the kidney of 23 Gy and / or the projected or actual cumulative absorbed dose to the kidneys at 1, 2, 3, 4, 5, 6, or 7 cycles is less than 23 Gy and no renal toxicities are observed.

[0340] In various embodiments, the present disclosure is further related to a radiopharmaceutical kit, comprising a vial containing at least a single dose of a 177Lu-PSMA I&T solution for injection to a human patient in need thereof, wherein the injection comprises a 6.7 GBq±0.10 GBq dose, 6.7 GBq±0.15 GBq dose, 6.7 GBq±0.20 GBq dose, 6.7 GBq±0.25 GBq dose, or 6.7 GBq±0.30 GBq dose, and wherein 177Lu-PSMA I&T treatment with 1, 2, 3, 4, 5, 6, or 7 cycles at the dose is possible without the risk of kidney toxicities and / or wherein 177Lu-PSMA I&T treatment with 1, 2, 3, 4, 5, 6, or 7 cycles provides a mean projected dose that is below a cumulative absorbed dose to the kidney of 23 Gy and / or the projected or actual cumulative absorbed dose to the kidneys at 1, 2, 3, 4, 5, 6, or 7 cycles is less than 23 Gy and no renal toxicities are observed.

[0341] In various embodiments, the present disclosure is further related to a radiopharmaceutical kit, comprising a vial containing at least a single dose of a 177Lu-PSMA I&T solution for injection to a human patient in need thereof, wherein the injection comprises a 6.8 GBq±0.10 GBq dose, 6.8 GBq±0.15 GBq dose, 6.8 GBq±0.20 GBq dose, 6.8 GBq±0.25 GBq dose, or 6.8 GBq±0.30 GBq dose, and wherein 177Lu-PSMA I&T treatment with 1, 2, 3, 4, 5, 6, or 7 cycles at the dose is possible without the risk of kidney toxicities and / or wherein 177Lu-PSMA I&T treatment with 1, 2, 3, 4, 5, 6, or 7 cycles provides a mean projected dose that is below a cumulative absorbed dose to the kidney of 23 Gy and / or the projected or actual cumulative absorbed dose to the kidneys at 1, 2, 3, 4, 5, 6, or 7 cycles is less than 23 Gy and no renal toxicities are observed.

[0342] In various embodiments, the present disclosure is further related to a radiopharmaceutical kit, comprising a vial containing at least a single dose of a 177Lu-PSMA I&T solution for injection to a human patient in need thereof, wherein the injection comprises a 6.9 GBq±0.10 GBq dose, 6.9 GBq±0.15 GBq dose, 6.9 GBq±0.20 GBq dose, 6.9 GBq±0.25 GBq dose, or 6.9 GBq±0.30 GBq dose, and wherein 177Lu-PSMA I&T treatment with 1, 2, 3, 4, 5, 6, or 7 cycles at the dose is possible without the risk of kidney toxicities and / or wherein 177Lu-PSMA I&T treatment with 1, 2, 3, 4, 5, 6, or 7 cycles provides a mean projected dose that is below a cumulative absorbed dose to the kidney of 23 Gy and / or the projected or actual cumulative absorbed dose to the kidneys at 1, 2, 3, 4, 5, 6, or 7 cycles is less than 23 Gy and no renal toxicities are observed.

[0343] In various embodiments, the present disclosure is further related to a radiopharmaceutical kit, comprising a vial containing at least a single dose of a 177Lu-PSMA I&T solution for injection to a human patient in need thereof, wherein the injection comprises a 7.0 GBq±0.10 GBq dose, 7.0 GBq±0.15 GBq dose, 7.0 GBq±0.20 GBq dose, 7.0 GBq±0.25 GBq dose, or 7.0 GBq±0.30 GBq dose, and wherein 177Lu-PSMA I&T treatment with 1, 2, 3, 4, 5, 6, or 7 cycles at the dose is possible without the risk of kidney toxicities and / or wherein 177Lu-PSMA I&T treatment with 1, 2, 3, 4, 5, 6, or 7 cycles provides a mean projected dose that is below a cumulative absorbed dose to the kidney of 23 Gy and / or the projected or actual cumulative absorbed dose to the kidneys at 1, 2, 3, 4, 5, 6, or 7 cycles is less than 23 Gy and no renal toxicities are observed.

[0344] In various embodiments, the present disclosure is further related to a radiopharmaceutical kit, comprising a vial containing at least a single dose of a 177Lu-PSMA I&T solution for injection to a human patient in need thereof, wherein the injection comprises a 7.1 GBq±0.10 GBq dose, 7.1 GBq±0.15 GBq dose, 7.1 GBq±0.20 GBq dose, 7.1 GBq±0.25 GBq dose, or 7.1 GBq±0.30 GBq dose, and wherein 177Lu-PSMA I&T treatment with 1, 2, 3, 4, 5, 6, or 7 cycles at the dose is possible without the risk of kidney toxicities and / or wherein 177Lu-PSMA I&T treatment with 1, 2, 3, 4, 5, 6, or 7 cycles provides a mean projected dose that is below a cumulative absorbed dose to the kidney of 23 Gy and / or the projected or actual cumulative absorbed dose to the kidneys at 1, 2, 3, 4, 5, 6, or 7 cycles is less than 23 Gy and no renal toxicities are observed.

[0345] In various embodiments, the present disclosure is further related to a radiopharmaceutical kit, comprising a vial containing at least a single dose of a 177Lu-PSMA I&T solution for injection to a human patient in need thereof, wherein the injection comprises a 7.2 GBq±0.10 GBq dose, 7.2 GBq±0.15 GBq dose, 7.2 GBq±0.20 GBq dose, 7.2 GBq±0.25 GBq dose, or 7.2 GBq±0.30 GBq dose, and wherein 177Lu-PSMA I&T treatment with 1, 2, 3, 4, 5, 6, or 7 cycles at the dose is possible without the risk of kidney toxicities and / or wherein 177Lu-PSMA I&T treatment with 1, 2, 3, 4, 5, 6, or 7 cycles provides a mean projected dose that is below a cumulative absorbed dose to the kidney of 23 Gy and / or the projected or actual cumulative absorbed dose to the kidneys at 1, 2, 3, 4, 5, 6, or 7 cycles is less than 23 Gy and no renal toxicities are observed.

[0346] In various embodiments, the present disclosure is further related to a radiopharmaceutical kit, comprising a vial containing at least a single dose of a 177Lu-PSMA I&T solution for injection to a human patient in need thereof, wherein the injection comprises a 7.3 GBq±0.10 GBq dose, 7.3 GBq±0.15 GBq dose, 7.3 GBq±0.20 GBq dose, 7.3 GBq±0.25 GBq dose, or 7.3 GBq±0.30 GBq dose, and wherein 177Lu-PSMA I&T treatment with 1, 2, 3, 4, 5, 6, or 7 cycles at the dose is possible without the risk of kidney toxicities and / or wherein 177Lu-PSMA I&T treatment with 1, 2, 3, 4, 5, 6, or 7 cycles provides a mean projected dose that is below a cumulative absorbed dose to the kidney of 23 Gy and / or the projected or actual cumulative absorbed dose to the kidneys at 1, 2, 3, 4, 5, 6, or 7 cycles is less than 23 Gy and no renal toxicities are observed.

[0347] In various embodiments, the present disclosure is further related to a radiopharmaceutical kit, comprising a vial containing at least a single dose of a 177Lu-PSMA I&T solution for injection to a human patient in need thereof, wherein the injection comprises a 7.4 GBq±0.10 GBq dose, 7.4 GBq±0.15 GBq dose, 7.4 GBq±0.20 GBq dose, 7.4 GBq±0.25 GBq dose, or 7.4 GBq±0.30 GBq dose, and wherein 177Lu-PSMA I&T treatment with 6 cycles at the dose is possible without the risk of kidney toxicities and / or wherein 177Lu-PSMA I&T treatment with 1, 2, 3, 4, 5, 6, or 7 cycles provides a mean projected dose that is below a cumulative absorbed dose to the kidney of 23 Gy and / or the projected or actual cumulative absorbed dose to the kidneys at 1, 2, 3, 4, 5, 6, or 7 cycles is less than 23 Gy and no renal toxicities are observed.

[0348] In various embodiments, the present disclosure is further related to a radiopharmaceutical kit, comprising a vial containing at least a single dose of a [177Lu]Lu-PSMA I&T solution for injection to a human patient in need thereof, wherein the injection comprises a 7.5 GBq±0.10 GBq dose, 7.5 GBq±0.15 GBq dose, 7.5 GBq±0.20 GBq dose, 7.5 GBq±0.25 GBq dose, or 7.5 GBq±0.30 GBq dose, and wherein [177Lu]Lu-PSMA I&T treatment with 1, 2, 3, 4, 5, 6, or 7 cycles at the dose is possible without the risk of kidney toxicities and / or wherein [177Lu]Lu-PSMA I&T treatment with 1, 2, 3, 4, 5, 6, or 7 cycles provides a mean projected dose that is below a cumulative absorbed dose to the kidney of 23 Gy and / or the projected or actual cumulative absorbed dose to the kidneys at 6 cycles is less than 23 Gy and no renal toxicities are observed.

[0349] In various embodiments, the present disclosure is further related to a radiopharmaceutical kit, comprising a vial containing at least a single dose of a [177Lu]Lu-PSMA I&T solution for injection to a human patient in need thereof, wherein the injection comprises a 7.4 GBq (mean 7.52±0.16 GBq) dose of [177Lu]Lu-PSMA-I&T, and wherein [177Lu]Lu-PSMA I&T treatment with 6 cycles at the dose is possible without the risk of kidney toxicities and / or wherein [177Lu]Lu-PSMA I&T treatment with 1, 2, 3, 4, 5, 6, or 7 cycles provides a mean projected dose that is below a cumulative absorbed dose to the kidney of 23 Gy and / or the projected or actual cumulative absorbed dose to the kidneys at 1, 2, 3, 4, 5, 6, or 7 cycles is less than 23 Gy and no renal toxicities are observed. The present disclosure is also further related to a radiopharmaceutical kit, comprising a vial containing at least a single dose of a [177Lu]Lu-PSMA I&T solution for injection to a human patient in need thereof, wherein the injection comprises a 7.4 GBq (mean 7.52±0.16 GBq) dose of [177Lu]Lu-PSMA-I&T, wherein [177Lu]Lu-PSMA I&T treatment with 1, 2, 3, 4, 5, 6, or 7 cycles provides a mean projected dose that is below a cumulative absorbed dose to the kidney of 23 Gy and / or the projected or actual cumulative absorbed dose to the kidneys at 1, 2, 3, 4, 5, 6, or 7 cycles is less than 23 Gy and no renal toxicities are observed.

[0350] The present disclosure is also further related to a radiopharmaceutical kit, comprising a vial containing at least a single dose of a [177Lu]Lu-PSMA I&T solution for injection to a human patient in need thereof, wherein the injection comprises a 6.5 GBq+ / −10% GBq dose, 6.5 GBq+ / −5% GBq dose, or 6.5 GBq+ / −3% GBq dose of 177Lu-PSMA-I&T, and wherein [177Lu]Lu-PSMA I&T treatment with 1, 2, 3, 4, 5, 6, or 7 cycles at the dose is possible without the risk of kidney toxicities and / or wherein [177Lu]Lu-PSMA I&T treatment with 1, 2, 3, 4, 5, 6, or 7 cycles provides a mean projected dose that is below a cumulative absorbed dose to the kidney of 23 Gy and / or the projected or actual cumulative absorbed dose to the kidneys at 1, 2, 3, 4, 5, 6, or 7 cycles is less than 23 Gy and no renal toxicities are observed.

[0351] The present disclosure is also further related to a radiopharmaceutical kit, comprising a vial containing at least a single dose of a [177Lu]Lu-PSMA I&T solution for injection to a human patient in need thereof, wherein the injection comprises a 6.8 GBq+ / −10% GBq dose, 6.8 GBq+ / −5% GBq dose, or 6.8 GBq+ / −3% GBq dose of [177Lu]Lu-PSMA-I&T, and wherein [177Lu]Lu-PSMA I&T treatment with 1, 2, 3, 4, 5, 6, or 7 cycles at the dose is possible without the risk of kidney toxicities and / or wherein [177Lu]Lu-PSMA I&T treatment with 1, 2, 3, 4, 5, 6, or 7 cycles provides a mean projected dose that is below a cumulative absorbed dose to the kidney of 23 Gy and / or the projected or actual cumulative absorbed dose to the kidneys at 1, 2, 3, 4, 5, 6, or 7 cycles is less than 23 Gy and no renal toxicities are observed.

[0352] The present disclosure is also further related to a radiopharmaceutical kit, comprising a vial containing at least a single dose of a [177Lu]Lu-PSMA I&T solution for injection to a human patient in need thereof, wherein the injection comprises a 7.4 GBq+ / −10% GBq dose, 7.4 GBq+ / −5% GBq dose, or 7.4 GBq+ / −3% GBq dose of 177Lu-PSMA-I&T, and wherein 177Lu-PSMA I&T treatment with 1, 2, 3, 4, 5, 6, or 7 cycles at the dose is possible without the risk of kidney toxicities and / or wherein [177Lu]Lu-PSMA I&T treatment with 1, 2, 3, 4, 5, 6, or 7 cycles provides a mean projected dose that is below a cumulative absorbed dose to the kidney of 23 Gy and / or the projected or actual cumulative absorbed dose to the kidneys at 1, 2, 3, 4, 5, 6, or 7 cycles is less than 23 Gy and no renal toxicities are observed.

[0353] The present disclosure is also further related to a radiopharmaceutical kit, comprising a vial containing at least a single dose of a [177Lu]Lu-PSMA I&T solution for injection to a human patient in need thereof, wherein the injection comprises a 7.4 (+ / −10%) GBq dose of [177Lu]Lu-PSMA-I&T, and wherein [177Lu]Lu-PSMA I&T treatment with 6 cycles at the dose is possible without the risk of kidney toxicities and / or wherein [177Lu]Lu-PSMA I&T treatment with 6 cycles provides a mean projected dose that is below a cumulative absorbed dose to the kidney of 23 Gy and / or the projected or actual cumulative absorbed dose to the kidneys at 6 cycles is less than 23 Gy and no renal toxicities are observed.

[0354] The present disclosure is further related to a radiopharmaceutical kit, comprising a vial containing at least a single dose of a [177Lu]Lu-PSMA I&T solution for injection to a human patient in need thereof, wherein the injection comprises a 7.4 GBq±0.10 GBq dose, 7.4 GBq±0.15 GBq dose, 7.4 GBq±0.20 GBq dose, 7.4 GBq±0.25 GBq dose, or 7.4 GBq±0.30 GBq dose, and wherein the projected cumulative absorbed dose to the kidneys at 6 cycles will be 20.4±10.2 Gy. The present disclosure is further related to a radiopharmaceutical kit, comprising a vial containing at least a single dose of a [177Lu]Lu-PSMA I&T solution for injection to a human patient in need thereof, wherein the injection comprises a 7.5 GBq±0.10 GBq dose, 7.5 GBq±0.15 GBq dose, 7.5 GBq±0.20 GBq dose, 7.5 GBq±0.25 GBq dose, or 7.5 GBq±0.30 GBq dose, and wherein the projected cumulative absorbed dose to the kidneys at 6 cycles will be 20.4±10.2 Gy.

[0355] In some embodiments, the present disclosure includes a kit that includes a predetermined amount of a composition that includes 177Lu-PSMA I&T. In another embodiment the molar ratio of the PSMA I&T to 177Lu is from 5.0:1.0 to 12.0:1.0. In another embodiment, the composition is suitable for administration to a human patient in need thereof.

[0356] Upon administration of the radiopharmaceutical composition to a patient, the patient may maintain low levels of hematotoxic and nephrotoxic toxicity. In some embodiments, the prostate-specific antigen (PSA) decline is more than about 40%, more than about 45%, more than about 50%, more than about 55%, more than about 60%, more than about 65%, more than about 70%, more than about 75%, or more than about 80%.

[0357] Further provided herein are methods of treating a patient with cancer and / or mCRPC by administering the radiopharmaceutical composition comprising 177Lu-PSMA I&T. The method may further comprise imaging the patient using PSMA-PET to document and confirm the patient is mCRPC positive prior to administering the radiopharmaceutical composition. For example, the patient may have a PSMA-PET scan (e.g. [68Ga]Ga-PSMA-11 or [18F]DCFPyL) positive as determined by central reader. In an embodiment provided herein is a method of imaging cancer in a human patient in thereof. In another embodiment, the method further includes administering to the human patient a composition that includes 177Lu-PSMA I&T. In another embodiment the molar ratio of the PSMA I&T to 177Lu is from 5.0:1.0 to 12.0:1.0.Indications and Contraindications

[0358] RLT with 177Lu-PSMA I&T may be indicated for the treatment of patients with cancer and / or mCRPC, who do not have any other approved therapy option planned by a multidisciplinary team. In an embodiment, a method of treating cancer in a patient in need thereof is provided herein.

[0359] In another embodiment, the method includes administering to the human patient a composition that includes 177Lu-PSMA I&T. In another embodiment the molar ratio of the PSMA I&T to 177Lu is from 1.0:1.0 to 12.0:1.0, 3.0:1.0 to 12.0:1.0, 5.0:1.0 to 12.0:1.0. In another embodiment the molar ratio of the PSMA I&T to 177Lu is from 1.0:1.0 to 8.0:1.0, 1.5:1.0 to 8.0:1.0, 2.0:1.0 to 8.0:1.0, 2.5:1.0 to 8.0:1.0, 3.0:1.0 to 8.0:1.0, 3.5:1.0 to 8.0:1.0, or 4.0:1.0 to 8.0:1.0. In another embodiment the molar ratio of the PSMA I&T to 177Lu is from 4.1:1.0 to 7.9:1.0, 4.2:1.0 to 7.8:1.0, 4.3:1.0 to 7.7:1.0, 4.4:1.0 to 7.6:1.0, 4.5:1.0 to 7.5:1.0, 4.6:1.0 to 7.4:1.0, 4.7:1.0 to 7.3:1.0, 4.8:1.0 to 7.2:1.0, 4.9:1.0 to 7.1:1.0, or 5.0:1.0 to 7.0:1.0. In another embodiment the molar ratio of the PSMA I&T to 177Lu is from 5.0:1.0 to 7.6:1.0, 5.1:1.0 to 7.5:1.0, 5.2:1.0 to 7.4:1.0, 5.3:1.0 to 7.3:1.0, or 5.4:1.0 to 7.2:1.0. In another embodiment the molar ratio of the PSMA I&T to 177Lu is from 8.0:1.0 to 10.0:1.0, 8.1:1.0 to 10.0:1.0, 8.2:1.0 to 10.0:1.0, 8.3:1.0 to 10.0:1.0, 8.4:1.0 to 10.0:1.0, 8.5:1.0 to 10.0:1.0, 8.6:1.0 to 10.0:1.0, 8.7:1.0 to 10.0:1.0, 8.8:1.0 to 10.0:1.0, 8.9:1.0 to 10.0:1.0, 9.0:1.0 to 10.0:1.0, 9.1:1.0 to 10.0:1.0, 9.2:1.0 to 10.0:1.0, 9.3:1.0 to 10.0:1.0, 9.4:1.0 to 10.0:1.0, 9.5:1.0 to 10.0:1.0, 9.6:1.0 to 10.0:1.0, 9.7:1.0 to 10.0:1.0, 9.8:1.0 to 10.0:1.0, or 9.9:1.0 to 10.0:1.0. In another embodiment the molar ratio of the PSMA I&T to 177Lu is from 8.0:1.0 to 11.0:1.0, 8.1:1.0 to 11.0:1.0, 8.2:1.0 to 11.0:1.0, 8.3:1.0 to 11.0:1.0, 8.4:1.0 to 11.0:1.0, 8.5:1.0 to 11.0:1.0, 8.6:1.0 to 11.0:1.0, 8.7:1.0 to 11.0:1.0, 8.8:1.0 to 11.0:1.0, 8.9:1.0 to 11.0:1.0, 9.0:1.0 to 11.0:1.0, 9.1:1.0 to 11.0:1.0, 9.2:1.0 to 11.0:1.0, 9.3:1.0 to 11.0:1.0, 9.4:1.0 to 11.0:1.0, 9.5:1.0 to 11.0:1.0, 9.6:1.0 to 11.0:1.0, 9.7:1.0 to 11.0:1.0, 9.8:1.0 to 11.0:1.0, 9.9:1.0 to 11.0:1.0, 10.0:1.0 to 11.0:1.0, 10.1:1.0 to 11.0:1.0, 10.2:1.0 to 11.0:1.0, 10.3:1.0 to 11.0:1.0, 10.4:1.0 to 11.0:1.0, 10.5:1.0 to 11.0:1.0, 10.6:1.0 to 11.0:1.0, 10.7:1.0 to 11.0:1.0, 10.8:1.0 to 11.0:1.0, or 10.9:1.0 to 11.0:1.0. The molar ratio of the PSMA I&T to 177Lu may be from 3.0:1.0 to 12.0:1.0, 3.5:1.0 to 12.0:1.0, 4.0:1.0 to 12.0:1.0, 4.4:1.0 to 12.0:1.0, 4.4:1.0 to 11.5:1.0, 4.4:1.0 to 11.0:1.0, 4.4:1.0 to 10.5:1.0, 4.4:1.0 to 10.0:1.0, 4.4:1.0 to 9.5:1.0, 4.4:1.0 to 9.0:1.0, 4.4:1.0 to 8.5:1.0, 4.4:1.0 to 8.0:1.0, 4.4:1.0 to 7.5:1.0, 4.4:1.0 to 7.0:1.0, 4.4:1.0 to 6.5:1.0, 4.4:1.0 to 6.0:1.0, 4.5:1.0 to 5.9:1.0, 4.6:1.0 to 4.7:1.0, 4.8:1.0 to 5.7:1.0, or 4.9:1.0 to 5.6:1.0. The molar ratio of the PSMA I&T to 177Lu may be from 5.0:1.0 to 12.0:1.0, 5.0:1.0 to 11.5:1.0, 5.0:1.0 to 11.0:1.0, 5.0:1.0 to 10.5:1.0, 5.0:1.0 to 10.0:1.0, 5.0:1.0 to 9.5:1.0, 5.0:1.0 to 9.0:1.0, 5.0:1.0 to 8.5:1.0, 5.0:1.0 to 8.0:1.0, 5.0:1.0 to 7.5:1.0, 5.0:1.0 to 7.0:1.0, 5.0:1.0 to 6.5:1.0, 5.0:1.0 to 6.0:1.0, 5.1:1.0 to 5.9:1.0, 5.2:1.0 to 5.8:1.0, 5.3:1.0 to 5.7:1.0, 5.4:1.0 to 5.6:1.0, or 5.45:1.0 to 5.55:1.0. The molar ratio of the PSMA I&T to 177Lu may be from 8.0:1.0 to 12.0:1.0, 8.0:1.0 to 11.5:1.0, 8.0:1.0 to 11.0:1.0, 8.0:1.0 to 10.5:1.0, 8.0:1.0 to 10.4:1.0, 8.0:1.0 to 10.3:1.0, 8.0:1.0 to 10.2:1.0, 8.0:1.0 to 10.1:1.0, 8.0:1.0 to 10.0:1.0, 8.0:1.0 to 9.9:1.0, 8.0:1.0 to 9.8:1.0, 8.0:1.0 to 9.7:1.0, 8.0:1.0 to 9.6:1.0, 8.0:1.0 to 9.5:1.0, 8.0:1.0 to 9.4:1.0, 8.0:1.0 to 9.3:1.0, 8.0:1.0 to 9.2:1.0, 8.0:1.0 to 9.1:1.0, or 8.0:1.0 to 9.0:1.0. The molar ratio of the PSMA I&T to 177Lu may be from 9.0:1.0 to 12.0:1.0, 9.0:1.0 to 11.5:1.0, 9.0:1.0 to 11.0:1.0, 9.0:1.0 to 10.5:1.0, 9.0:1.0 to 10.4:1.0, 9.0:1.0 to 10.3:1.0, 9.0:1.0 to 10.2:1.0, 9.0:1.0 to 10.1:1.0, 9.0:1.0 to 10.0:1.0, 9.0:1.0 to 9.9:1.0, 9.0:1.0 to 9.8:1.0, 9.0:1.0 to 9.7:1.0, 9.0:1.0 to 9.6:1.0, or 9.0:1.0 to 9.5:1.0.

[0360] The molar ratio of the PSMA I&T to 177Lu may be from 11.0:1.0 to 12.0:1.0, 11.1:1.0 to 11.9:1.0, 11.2:1.0 to 11.8:1.0, 11.3:1.0 to 11.7:1.0, or 11.4:1.0 to 11.6:1.0. The molar ratio of the PSMA I&T to 177Lu may be from 10.0:1.0 to 11.0:1.0, 10.1:1.0 to 10.9:1.0, 10.2:1.0 to 10.8:1.0, 10.3:1.0 to 10.7:1.0, or 10.4:1.0 to 10.6:1.0. The molar ratio of the PSMA I&T to 177Lu may be from 9.0:1.0 to 10.0:1.0, 9.1:1.0 to 9.9:1.0, 9.2:1.0 to 9.8:1.0, 9.3:1.0 to 9.7:1.0, or 9.4:1.0 to 9.6:1.0. The molar ratio of the PSMA I&T to 177Lu may be from 8.0:1.0 to 9.0:1.0, 8.1:1.0 to 8.9:1.0, 8.2:1.0 to 8.8:1.0, 8.3:1.0 to 8.7:1.0, or 8.4:1.0 to 8.6:1.0. The molar ratio of the PSMA I&T to 177Lu may be from 7.0:1.0 to 8.0:1.0, 7.1:1.0 to 7.9:1.0, 7.2:1.0 to 7.8:1.0, 7.3:1.0 to 7.7:1.0, or 7.4:1.0 to 7.6:1.0. The molar ratio of the PSMA I&T to 177Lu may be from 6.0:1.0 to 7.0:1.0, 6.1:1.0 to 6.9:1.0, 6.2:1.0 to 7.8:1.0, 7.3:1.0 to 7.7:1.0, or 7.4:1.0 to 6.6:1.0. The molar ratio of the PSMA I&T to 177Lu may be from 5.0:1.0 to 6.0:1.0, 5.1:1.0 to 5.9:1.0, 5.2:1.0 to 5.8:1.0, 5.3:1.0 to 5.7.0:1.0, or 5.4:1.0 to 5.6:1.0. The molar ratio of the PSMA I&T to 177Lu may be from 4.4:1.0 to 5:0:1.0, 4.5:1.0 to 5:0:1.0, 4.6:1.0 to 5:0:1.0, 4.7:1.0 to 5:0:1.0, 4.8:1. to 5:0:1.0, or 4.9:1. to 5:0:1.0.

[0361] The molar ratio of the PSMA I&T to 177Lu may be about 5.0:1.0 to about 5.5:1.0, about 5.5:1.0 to about 6.0:1.0, about 6.0:1.0 to about 6.5:1.0, about 6.5:1.0 to about 7.0:1.0, about 7.0:1.0 to about 7.5:1.0, about 7.5:1.0 to about 8.0:1.0, about 8.0:1.0 to about 8.5:1.0, about 8.5:1.0 to about 9.0:1.0, about 9.0:1.0 to about 9.5:1.0, about 9.5:1.0 to about 10.0:1.0, about 10.0:1.0 to about 10.5:1.0, about 10.5:1.0 to about 11.0:1.0, about 11.0:1.0 to about 11.5:1.0, or about 11.5:1.0 to about 12.0:1.0.

[0362] In another embodiment, in the compositions, kits, and methods described herein, the PSMA I&T to [177Lu]Lu3+ ratio in μg:mCi may be ≤0.65, ≤0.64, ≤0.63, ≤0.62, ≤0.61, or ≤0.60. In another embodiment, in the compositions, kits, and methods described herein, the PSMA I&T to [177Lu]Lu3+ ratio in μg:mCi may be from about 0.20 to about 0.64, about 0.20 to about 0.63, about 0.20 to about 0.62, about 0.20 to about 0.61, or about 0.20 to about 0.60. In another embodiment, in the compositions, kits, and methods described herein, the PSMA I&T to [177Lu]Lu3+ ratio in μg:mCi may be from about 0.21 to about 0.59, about 0.22 to about 0.58, about 0.23 to about 0.57, about 0.24 to about 0.56, about 0.25 to about 0.55, about 0.26 to about 0.54, about 0.27 to about 0.53, about 0.28 to about 0.52, about 0.29 to about 0.51, about 0.30 to about 0.50, about 0.31 to about 0.49, about 0.32 to about 0.48, about 0.33 to about 0.47, about 0.34 to about 0.46, about 0.35 to about 0.45, about 0.36 to about 0.44, about 0.37 to about 0.43, about 0.38 to about 0.42, about 0.39 to about 0.41. In another embodiment, in the compositions, kits, and methods described herein, the PSMA I&T to [177Lu]Lu3+ ratio in μg:mCi may be from about 0.50 to about 0.64, about 0.50 to about 0.63, about 0.50 to about 0.62, about 0.50 to about 0.61, about 0.50 to about 0.60, about 0.50 to about 0.59, about 0.50 to about 0.58, about 0.50 to about 0.57, about 0.50 to about 0.56, about 0.50 to about 0.55, about 0.50 to about 0.54, about 0.50 to about 0.53, about 0.50 to about 0.52, or about 0.50 to about 0.51. In another embodiment, in the compositions, kits, and methods described herein, the PSMA I&T to [177Lu]Lu3+ ratio in μg:mCi may be from about 0.40 to about 0.64, about 0.40 to about 0.63, about 0.40 to about 0.62, about 0.40 to about 0.61, about 0.40 to about 0.60, about 0.40 to about 0.59, about 0.40 to about 0.58, about 0.40 to about 0.57, about 0.40 to about 0.56, about 0.40 to about 0.55, about 0.40 to about 0.54, about 0.40 to about 0.53, about 0.40 to about 0.52, about 0.40 to about 0.51, about 0.40 to about 0.50, about 0.40 to about 0.49, about 0.40 to about 0.48, about 0.40 to about 0.47, about 0.40 to about 0.46, about 0.40 to about 0.45, about 0.40 to about 0.44, about 0.40 to about 0.43, about 0.40 to about 0.42, about 0.40 to about 0.41. In another embodiment, in the compositions, kits, and methods described herein, the PSMA I&T to [177Lu]Lu3+ ratio in μg:mCi may be from about 0.35 to about 0.64, about 0.35 to about 0.63, about 0.35 to about 0.62, about 0.35 to about 0.61, about 0.35 to about 0.60, about 0.35 to about 0.59, about 0.35 to about 0.58, about 0.35 to about 0.57, about 0.35 to about 0.56, about 0.35 to about 0.55, about 0.35 to about 0.54, about 0.35 to about 0.53, about 0.35 to about 0.52, about 0.35 to about 0.51, about 0.35 to about 0.50, about 0.35 to about 0.49, about 0.35 to about 0.48, about 0.35 to about 0.47, about 0.35 to about 0.46, about 0.35 to about 0.45, about 0.35 to about 0.44, about 0.35 to about 0.43, about 0.35 to about 0.42, about 0.35 to about 0.41, about 0.35 to about 0.40, about 0.35 to about 0.39, about 0.35 to about 0.38, about 0.35 to about 0.37, or about 0.35 to about 0.36. In another embodiment, in the compositions, kits, and methods described herein, the PSMA I&T to [177Lu]Lu3+ ratio in μg:mCi may be from about 0.30 to about 0.64, about 0.30 to about 0.63, about 0.30 to about 0.62, about 0.30 to about 0.61, about 0.30 to about 0.60, about 0.30 to about 0.59, about 0.30 to about 0.58, about 0.30 to about 0.57, about 0.30 to about 0.56, about 0.30 to about 0.55, about 0.30 to about 0.54, about 0.30 to about 0.53, about 0.30 to about 0.52, about 0.30 to about 0.51, about 0.30 to about 0.50, about 0.30 to about 0.49, about 0.30 to about 0.48, about 0.30 to about 0.47, about 0.30 to about 0.46, about 0.30 to about 0.45, about 0.30 to about 0.44, about 0.30 to about 0.43, about 0.30 to about 0.42, about 0.30 to about 0.41, about 0.30 to about 0.40, about 0.30 to about 0.39, about 0.30 to about 0.38, about 0.30 to about 0.37, about 0.30 to about 0.36, about 0.30 to about 0.35, about 0.30 to about 0.34, about 0.30 to about 0.33, about 0.30 to about 0.32, or about 0.30 to about 0.31. In another embodiment, in the compositions, kits, and methods described herein, the PSMA I&T to [177Lu]Lu3+ ratio in μg:mCi may be from about 0.25 to about 0.64, about 025 to about 0.63, about 0.25 to about 0.62, about 0.25 to about 0.61, about 0.25 to about 0.60, about 0.25 to about 0.59, about 0.25 to about 0.58, about 0.25 to about 0.57, about 0.25 to about 0.56, about 0.25 to about 0.55, about 0.25 to about 0.54, about 0.25 to about 0.53, about 0.25 to about 0.52, about 0.25 to about 0.51, about 0.25 to about 0.50, about 0.25 to about 0.49, about 0.25 to about 0.48, about 0.25 to about 0.47, about 0.25 to about 0.46, about 0.25 to about 0.45, about 0.25 to about 0.44, about 0.25 to about 0.43, about 0.25 to about 0.42, about 0.25 to about 0.41, about 0.25 to about 0.40, about 0.25 to about 0.39, about 0.25 to about 0.38, about 0.25 to about 0.37, about 0.25 to about 0.36, about 0.25 to about 0.35, about 0.25 to about 0.34, about 0.25 to about 0.33, about 0.25 to about 0.32, about 0.25 to about 0.31, about 0.25 to about 0.30, about 0.25 to about 0.29, about 0.25 to about 0.28, about 0.25 to about 0.27, or about 0.25 to about 0.26. In another embodiment, in the compositions, kits, and methods described herein, the PSMA I&T to [177Lu]Lu3+ ratio in μg:mCi may be from about 0.20 to about 0.30.

[0363] In another embodiment, the patient is treatment naïve. In another embodiment, the patient is not treatment naïve.

[0364] In an embodiment, the pharmaceutical composition is administered to the cancer patient as a first line therapy. In another embodiment, the pharmaceutical composition is administered to the patient as a regimen. In another embodiment, the pharmaceutical composition being administered has a radiochemical purity of greater than 95% at administration.

[0365] In an embodiment, the method of treating cancer prolongs a disease progression time of said cancer in a patient in thereof. In another embodiment, the method of treating cancer prolongs a survival of the patient. In another embodiment, the method of treating cancer increases progression-free survival of said patient. In another embodiment, the cancer is metastatic castration-resistant prostate cancer (mCRPC).

[0366] In some embodiments, the patient also has histologically or pathologically confirmed prostate adenocarcinoma without predominant small cell component, has progressive disease by one or more of the following criteria: a) Serum / plasma PSA progression defined as 2 consecutive increases in PSA over a previous reference value measured at least 1 week apart with a minimum start value of >2 ng / ml; or b) Progression of measurable disease (RECIST 1.1) or presence of at least two new bone lesions (PCWG3 criteria), and / or has had previous treatment with a next-generation androgen receptor (AR)-directed therapy (e.g. abiraterone, enzalutamide, apalutamide, darolutamide). In additional embodiments, the patient may have effective castration with a serum testosterone level of <50 ng / dL and plan to continue with chronic medical or surgical castration. mCRPC patients should undergo hormone therapy and chemotherapy as well as bone targeted therapy, if indicated.

[0367] In at least one example, a patient in need of RLT using 177Lu-PSMA I&T may fulfill the following criteria:

[0368] 1) mCRPC with PSMA positive metastatic disease based upon PSMA-PET or SPECT imaging. There are no limitations regarding the number or site of metastases, i.e. bone or soft tissue metastases. Caution should be given to patients e.g. with diffuse bone marrow, perineural and brain metastases.

[0369] 2) After initial hormone therapy (LH-RH agonists / antagonists). Progressive disease, i.e. biochemical and / or radiologic progression, despite newly developed hormone therapies (Abiraterone / Enzalutamide) or these medications may be avoided by the patient. Progressive disease despite chemotherapy (Docetaxel and Cabazitaxel) or the patient being unfit for chemotherapy or avoiding chemotherapy.

[0370] 3) Not suitable for 153Sm-EDTMP or [223Ra]RaCl2 or other local available radiopharmaceuticals for bone-targeted therapies due to extra-osseous metastases or diffuse bone marrow metastases or avoided by the patient. In patients without adequate response to bone-targeted therapies for pain palliation or exacerbation of pain even by such therapy, an RLT with 177Lu-PSMA I&T can be evaluated.

[0371] 4) Life expectancy longer than 4-6 months.

[0372] 5) Decision for salvage therapy at the institutional interdisciplinary tumor board.

[0373] In summary, mCRPC patients should undergo hormone therapy and chemotherapy as well as bone targeted therapy, if indicated. In the case of any contraindication for one of these therapies, it should be discussed and documented in an interdisciplinary tumor board.

[0374] Contraindications are as follows:

[0375] (1)WBC≤1×109 / 1.(2) Hb≤80 g / l. (In the case of symptomatic anemia, a red blood cell transfusion should precede the therapy. RLT with 177Lu-PSMA I&T may have a positive effect on bone marrow depression, causing the need for less blood to be transfused due to tumor regression in bone marrow. It should be noted that pure anemia without thrombocytopenia and leucopenia is not a contraindication for RLT.)

[0377] (3)Platelets≤70×109 / 1.(4) Creatinine>1.5 UNL; Kidney failure with creatinine clearance<30 mL / min

[0379] (5) Absolute obstruction in renal excretion.

[0380] (6) Previous chemotherapy or bone-targeted radionuclide therapy and extended external beam irradiation fields to the bone marrow (pelvis, spine), if performed during 4 weeks preceding the RLT

[0381] (7) ECOG performance status>2.

[0382] (8) Hypersensitivity to the active substance or to any of the excipients.

[0383] After a patient in need thereof has been identified, the activity of the radiopharmaceutical composition may be confirmed prior to administration. The radioactivity of the 177Lu-PSMA I&T composition may be 6.5-7.5 GBq or within a range of 6.0-8.0 GBq. The radioactivity may be reduced to 4.0-5.0 GBq in the case of impaired renal function (e.g. Creatinine within 1.0-1.5 UNL).

[0384] The radiopharmaceutical composition solution may be infused intravenously as a slow bolus (over about 10-15 minutes) followed by 500-1000 ml Ringer or NaCl solution. The patient may be encouraged to void as frequently as possible and drink about 2 liters of water daily. Patients with dilated non-obstructive renal disease may be administered diuretics.

[0385] The pharmaceutical composition may be administered as 2-11 cycles of the RLT every 5-8 weeks. In the case of continuously increasing PSA, after the first two cycles accompanied by worsening of the general condition, the indication of further RLTs may be re-evaluated. In the case of a decreasing PSA to <1.0 μg / l during the therapy cycles, a PSMA imaging may evaluate existence of small PSMA-positive metastases after completion of RLT when a post injection SPECT study is not enough to be informative. In the case of a significant decline of platelets or leukocytes, the time interval between 2 cycles may be prolonged.

[0386] At least one whole body scan 24-48 hours post injection (preferably with SPECT / CT) may be performed. In patients with diffuse bone and bone marrow metastases as well as in patients with brain metastases, a concomitant corticosteroid therapy (e.g. prednisolone 20 mg / daily) may be administered in the first two weeks after administration of the radiopharmaceutical composition.

[0387] In some embodiments, after administration of the radiopharmaceutical composition, the patient may have improved radiographic progression free survival (rPFS). A patient administered the radiopharmaceutical composition may have an rPFS of about 6 to about 12 months after initiating administration of the radiopharmaceutical composition. In various embodiments, the patient administered the radiopharmaceutical composition may have an rPFS of at least 6 months, 7 months, 8 months, 9 months, 10 months, 11 months, or 12 months after initiating administration of the radiopharmaceutical composition. For example, treatment of patients with 177Lu-PSMA I&T may increase the rPFS from 6 months using standard of care to up to 10 months using the radiopharmaceutical composition. Radiographic progression free survival may be defined as the time from randomization to radiographic progression (using PCWG3 and RECIST 1.1 criteria as assessed by blinded independent central review [BICR]) or death due to any cause.

[0388] In an embodiment, the patient may have improved overall survival (OS) after initiating administration of the radiopharmaceutical composition. A patient administered the radiopharmaceutical composition may have an overall survival of about 18 to about 26 months after initiating administration of the radiopharmaceutical composition. In various embodiments, the patient administered the radiopharmaceutical composition may have an OS of at least 18 months, 19 months, 20 months, 21 months, 22 months, 23 months, 24 months, 25 months, or 26 months after initiating administration of the radiopharmaceutical composition. For example, treatment of patients with 177Lu-PSMA I&T may increase the OS from 18 months using standard of care to up to 25 months using the radiopharmaceutical composition.

[0389] In another embodiment, the patient may have improved second radiographic progression free survival (rPFS 2) after initiating administration of the radiopharmaceutical composition.

[0390] In some embodiments, the patient may have improved progression free survival after initiating administration of the radiopharmaceutical composition. In additional embodiments, the patient may have improved second progression-free survival after initiating administration of the radiopharmaceutical composition. The second progression-free survival may be the second occurrence of PCWG3 progression, clinical / symptomatic progression and / or pain progression, or death due to any cause.

[0391] In an embodiment, the patient may have an improved PSA50 response rate after initiating administration of the radiopharmaceutical composition. The PSA50 response rate may be the response rate of patients who achieve a reduction of ≥50% in PSA from the baseline PSA assessment.

[0392] In an embodiment, the patient may have an improved time to first symptomatic skeletal event (SSE) after initiating administration of the radiopharmaceutical composition. An SSE may be the occurrence of either bone-directed radiotherapy to relieve bone pain, new symptomatic pathologic fractures, spinal cord compression, or tumor-related orthopedic surgery.

[0393] In an embodiment, the patient may have an improved time to soft tissue progression (STP) after initiating administration of the radiopharmaceutical composition. STP may include the occurrence of radiographic progression in soft tissue. In another embodiment, the patient may have an improved time to chemotherapy (TTC) after initiating administration of the radiopharmaceutical composition.

[0394] In an embodiment, the patient may have improved results on a Quality of Life Questionnaire after initiating administration of the radiopharmaceutical composition. For example, the Quality of Life (QoL) may be assessed via European Organisation for Research and Treatment of Cancer Quality of Life Questionnaire C30 (EORTC QLQ-C30). The EORTC QLQ-C30 is a questionnaire of thirty quality of life (QoL) questions developed to assess the QoL of cancer patients. The EORTC QLQ-C30 comprises 30 items, 24 of which are aggregated into nine multi-item scales, which are scored from 0 to 100.EXAMPLES

[0395] The following non-limiting examples are provided for illustrative purposes only, and therefore should not be viewed in a limiting sense.Analytical Procedures

[0396] The product was identified by subsequent injection of reference solution of Lu-PSMA I&T and formulated solution to a liquid chromatography system. Radio nuclidic identity was determined by gamma ray energy detection.

[0397] pH was estimated by pH paper. Radioactivity was measured in a dose calibrator. Radiochemical purity was determined by liquid chromatography with radioactivity detection and thin layer chromatography.

[0398] The radioactivity of [177Lu]Lu-PSMA I&T was determined by a dose calibrator when the dose is dispensed.

[0399] Bacterial endotoxin content was determined for each batch before release using a PTS-tester (Ph Eur method D, USP<85>). Sterility was determined according to Ph Eur and in alignment with USP<71>.

[0400] Qualities of analytical procedures used for the drug product—e.g., specificity, linearity, and reproducibility—were investigated by using a known reference standard for the unlabeled precursor. All analytical procedures were found suitable for their intended use.

[0401] An acceptance criterion for the radioactivity in the formulation is not set since this will vary depending on the individual clinical need assessed by the health care professional responsible for administering the formulation. The radioactive content must be within 90%-110% of the stated value at the date and time stated on the label.Example 1: Method of Manufacturing 177Lu-PSMA I&T Radiopharmaceutical Formulation

[0402] Multiple radiopharmaceutical compositions were produced using the process as outlined in Table 2A and 2B below. Radiolabeling was performed using non-carrier added [177Lu]LuCl3. Compositions 1 and 2 are essentially the same. In Composition 3, the pH of the ascorbic acid solution was adjusted to 4.5, the amount of ascorbic acid was lowered, the amount of ethanol was lowered, and the pH of the final radiopharmaceutical composition was adjusted to 4.5. This resulted in Composition 3 having an extended shelf life as compared to Compositions 1 and 2.

[0403] The synthesis of 177Lu-PSMA I&T utilizes an automated synthesis module in a controlled environment. The labelling solution containing [177Lu]Lutetium chloride ([177Lu]LuCl3) is connected to the synthesis cassette containing the other chemicals components required for the labeling process. 177LuCl3 solution is transferred into reactor for radiolabeling and may be rinsed with additional required amount of 0.04 M HCl solution. The labelling solutions varies in volume depending on the 177Lu radioactivity.

[0404] The [177Lu]LuCl3 solution is mixed in the reaction chamber with a solution of 0.4 M Sodium acetate buffer containing the diluted PSMA I&T precursor. The solution is heated in the reactor. After heating, the produced 177Lu-PSMA I&T is trapped on a C18 cartridge pre-conditioned with water. The cartridge is rinsed with sterile water and the final product is eluted from the C18 cartridge with 1.5 ml of 50% sterile ethanol-water mixture into a bulk vial. The drug substance is formed in situ and is directly formulated into the drug product.

[0405] For final volume adjustment a formulation matrix containing 50 mg / ml ascorbic acid and ethanol in water for injection is added to the bulk vial. The composition of final product is fixed, and the amount of formulation matrix added depends on the radioactivity of 177Lu used in the batch.

[0406] The formulation matrix is prepared from a solution of ascorbic acid that is diluted to 50 mg / ml concentration using water for injection. The ethanol concentration is adjusted to 3.8%±1.0% (v / v) to match the concentration of the synthesis bulk product regardless of the extent of dilution required.

[0407] The synthesis is a one-step labelling process with C18 purification using injections grade ethanol and water as the only solvents, therefore no residual solvents are present.

[0408] Radiochemical impurities are quantified by chromatographical methods (HPLC and TLC). Radiochemical purity determined by HPLC must not be less than 95.0%

[0409] Depending on the total produced radioactivity the bulk product is diluted to a fixed radioactivity concentration of about 500 MBq / ml.

[0410] The solution is filtered through a 0.22 μm membrane filter into sterile product vials. In addition to patient doses, sample vials are also dispensed from each production batch (chemical QC sample, microbiological QC sample, and a reference sample for retention). The final product is dispensed in a Grade A controlled environment. The integrity of the filters is tested after filtration by performing a bubble point test prior to product release. The fill weight / volume and radioactivity is checked for dispensed patient vials. The solution is ready for use after pre-release quality control and QP release.

[0411] Radioactivity is monitored with a dose calibrator after the labelling process in order to ensure successful labelling and during dispensing to verify dispensed dosesTABLE 2ARadiolabeling ProcessProcess 1Process 2Process 3Process 4Lu-17740 GBq / ml in40 GBq / ml in~40 GBq / ml in5500-15200mCi0.04M HCl0.04M HCl0.05M HClPSMA-I&T1 000μg / ml463μg / ml463μg / ml1000μg / mLprecursorReaction4 ml 0.4M4 ml 0.4M4 ml 0.4M82 mg / mLBufferSodium AcetateSodium AcetateSodium AcetateSodium Ascorbate2 ml 0.04M HCl2 ml 0.04M HCl1.6 ml 0.05M HCl(0.08 mmol HCl)(0.08 mmol HCl)(0.08 mmol HCl)150 μl150 μl150 μl20% L-ascorbic acid20% L-ascorbic acid20% L-ascorbic acidReaction6-8ml6-8ml6-8mlDependent onVolumereaction scale;16 mL maximumHeatingSetpoint 110° C.,Setpoint 110° C.,Setpoint 110° C.,85° C.,15 min15 min15 min10 minPurificationSep Pak C18Sep Pak C18Sep Pak C18N / AElution1.5 ml Ethanol-1.5 ml Ethanol-1.5 ml Ethanol-N / AWater 1:1Water 1:1Water 1:1Cassette8.5 ml Ascorbic8.5 ml Ascorbic8.5 ml AscorbicN / Aflushacid 50 mg / mlacid 50 mg / mlacid 50 mg / ml,(pH 5.5-7.0)(pH 5.5-7.0)pH 4.5Formulation42.5 mg / ml42.5 mg / ml31 mg / ml33.0 mg / mLbufferascorbic acid,ascorbic acid,ascorbic acid,sodium ascorbate;7.5% Ethanol7.5% Ethanol3.8% Ethanol0.1 mg / mL DTPA;(v / v %), pH 5.5-7.0(v / v %), pH 5.5-7.0(v / v %), pH 4.5pH 4.25

[0412] The resulting Compositions 1-3 from Processes 1-3 are provided below in Table 2B, which provides the compositions for both a 1 ml volume and a vial of 10 ml or 20 ml for each composition.TABLE 2B[177Lu]Lu-PSMA I&T compositions 1-3.Compositions 1 and 2Composition 3QuantityQuantity / QuantityQuantity / Componentper mL10 mL vialper mL20 mL vialFunction177Lu-PSMA1 GBq10 GBq0.5 GBq10 GBqRadioactiveI&T(27 mCi)(270 mCi)(13.5 mCi)(270 mCi)pharmaceuticalingredient(exact activity / volume adjustedaccording todose strength)Lu-PSMA<12μg<80μg<6μg<80μgMass ofI&T andpharmaceuticalrelatedingredientsubstancesAscorbic acid42.5mg425mg31mg620mgRadioprotectantDisodium21μg210μg15.5μg310μgMetal scavengerEDTASodiumA sufficientA sufficientA sufficientA sufficientPresent inBicarbonatequantityquantityquantityquantityformulatedNaOHA sufficientA sufficientA sufficientA sufficientAscorbic acidquantityquantityquantityquantityInjection (USP)in sufficientamounts tocontrol pH to5.5-7.0HydrochloricNoneNone1.7mg / ml *34mg / ml **Theoreticalacidamount. Addedto adjust finalformulationpH to 4.5Ethanol75 μL750 μL37.5 μL750 μLStabilizing(58.9 mg)(589 mg)(29.5 mg)(589 mg)agentWater forSufficient toSufficient toSufficient toSufficient toVehicleInjectionmake 1 mLmake 10 mLmake 1 mLmake 20 mLExample 2: Stability of the Radiochemical Compositions

[0413] Stability of 177Lu-PSMA I&T composition 1 was tested and the radiochemical purity and chemical properties were shown to provide adequate stability of 48 hours from the end-of-synthesis time for samples stored at +5° C., +20° C. and +40° C., Table 3.

[0414] Stability studies show that [177Lu]Lu-PSMA I&T composition 3 (Tables 4A-H) comprising ascorbic acid 31 mg / ml and ethanol 3.8% (v / v) at a pH of 4.5 had improved stability and extended shelf life compared to [177Lu]Lu-PSMA I&T composition 1.

[0415] The radiochemical purity and chemical properties (pH, impurities, visual properties) of [177Lu]Lu-PSMA I&T in the formulation composition 3 were tested on the seven batches over a time span of 70 to 72 hours from the end-of-synthesis time. Stability samples of typical therapeutic dose radioactivity and volume were stored in different conditions covering typical storage, shipment and usage of the product, including temperatures ranging from +5° C. to +40° C.

[0416] Final radioactivity concentration in the sample solutions varied from 497 MBq / ml to 642 MBq / ml at the end of dispensing.

[0417] All stability samples met the set acceptance criteria. Radiochemical purity was ≥95.7% after 70 hours or 72 hours after end of synthesis time in all samples analyzed.

[0418] Based on the results 177Lu-PSMA I&T solution in formulation composition 3 was stable under the different storge conditions tested.TABLE 3Stability Data of 177Lu-PSMA I&T Composition 1.Stability data at 48 h after end of synthesisStability criteriaBatchBatchBatchBatchBatchTestSpecification#1#2#3, +5° C.#3, +20° C.#3, +40° C.VisualClear, colorlessPassPassPassPassPassinspectionor slightlyyellow liquid,no visibleparticlespH5.0-8.06.05.56.0 6.05.5Radiochemical≥95.0% as97.4%96.2%95.6%96.195.1%Purity177Lu-PSMA(HPLC), %I&TRadiochemical177Lu-colloid ≤5.0%  0%  0%  0%0%  0%Purity byof radioactivityTLC, %ChemicalLu-PSMA I&T-1.62.21.91.81.8purityconcentration ≤12.0μg / mlμg / mlμg / mlμg / mlμg / mlLu-PSMA I&Tμg / mlTABLE 4AChemical Quality in the Validation Batches of 177Lu-PSMA I&T Composition 3.QC TESTINGQuality AttributeVALIDATION BATCH #TestSpecification123Visual inspectionClear, colorlessPassPassPassto yellowsolution, novisible particlesRadiochemicalCo-elutes withPassPassPassIdentityreferencestandard †pH4.0-5.04.54.54.5RadionuclidicGamma ray energy113 keV and113 keV and113 keV andIdentification113 ± 2 keV209 keV209 keV209 keVkeV208 ± 4 keVno otherno otherno other(HPGe-detector)significantsignificantsignificantNo otherpeakspeakspeakssignificantdetecteddetecteddetectedpeaks withgamma energy >100keV are detectedRadiochemical≥95.0% as 98.2% 98.2% 97.9%Purity (HPLC), %177Lu-PSMAI&TRadiochemical177Lu-   0%   0%   0%Purity by TLC, %colloid ≤5.0%of radioactivityEthanol content, %2.5-4.5% 3.5% 3.5% 3.2%(v / v) (GC)Chemical purityLu-PSMA I&T-1.2μg / ml1.2μg / ml1.2μg / mlLu-PSMA I&Tconcentration ≤6.0μg / ml177Lu-PSMA-I&TReported271GBq / μmol275GBq / μmol191GBq / μmolSpecific activityAscorbic acid15-35 mg / ml25mg / ml25mg / ml25mg / mlconcentrationmg / mlRadionuclidic≥99.9% of the100.0%100.0%100.0%puritytotal activity of177LuBacterial<175 EU / 20 ml<5.00EU / ml<5.00EU / ml<5.00EU / mlendotoxins(measured <8.75EU / ml(EU / ml))Filter≥3.32 barPassPassPassintegrity testtested withwaterSterilitySterilePassPassPass† The radiometric RT of the test sample = UV RT of Reference Standard ± 5%.TABLE 4BStability Data of 177Lu-PSMA I&T Composition 3.STABILITY BATCH #170 h post End of SynthesisVIAL #1234Radioactivity9430MBq9440MBq9440MBq9430MBqFill Volume18.04ml18.10ml18.07ml18.03mlStorage Condition+22.5°C.+32.5°C.+22.5° C. / +22.5°C.InvertedQC TESTINGValidationcriteriaTestSpecificationVisualClear, colorlessPassPassPassPassinspectionto yellowsolution, novisible particlesRadiochemicalCo-elutes withPassPassPassPassIdentityreferencestandard †pH4.0-5.04.54.54.54.5RadionuclidicGamma ray energy113 keV and113 keV and113 keV and113 keV andIdentification113 ± 2 keV209 keV209 keV209 keV209 keVkeV208 ± 4 keVno otherno otherno otherno other(HPGe-detector)significantsignificantsignificantsignificantNo otherpeakspeakspeakspeakssignificantdetecteddetecteddetecteddetectedpeaks withgamma energy >100keV are detectedRadiochemical≥95.0% as96.7%96.2%95.9%96.0%Purity177Lu-PSMA(HPLC), %I&TRadiochemical177Lu-  0%  0%  0%  0%Purity bycolloid ≤5.0%TLC, %of radioactivityEthanol2.5-4.5%N / AN / AN / AN / Acontent, %(v / v) (GC)ChemicalLu-PSMA I&T -1.3μg / ml1.3μg / ml1.2μg / ml1.3μg / mlpurityconcentration ≤6.0Lu-PSMA I&Tμg / mlAscorbic acid15-35 mg / ml25mg / ml25mg / ml25mg / ml25mg / mlconcentrationmg / ml† The radiometric RT of the test sample = UV RT of Reference Standard ± 5%.TABLE 4CStability Data of 177Lu-PSMA I&T Composition 3.STABILITY BATCH #272 h post End of SynthesisVIAL #1234Radioactivity9650MBq9550MBq9540MBq9540MBqFill Volume15.02ml14.86ml14.86ml14.87mlStorage Condition+22.5°C.+32.5°C.+22.5° C. / +22.5°C.InvertedQC TESTINGValidationcriteriaTestSpecificationVisualClear, colorlessPassPassPassPassinspectionto yellowsolution, novisible particlesRadiochemicalCo-elutes withPassPassPassPassIdentityreferencestandard †pH4.0-5.04.54.54.54.5RadionuclidicGamma ray113 keV and113 keV and113 keV and113 keV andIdentificationenergy209 keV209 keV209 keV209 keVkeV113 ± 2 keVno otherno otherno otherno other208 ± 4 keVsignificantsignificantsignificantsignificant(HPGe-detector)peakspeakspeakspeaksNo otherdetecteddetecteddetecteddetectedsignificantpeaks withgamma energy >100keV are detectedRadiochemical≥95.0% as96.0%95.7%96.1%96.1%Purity177Lu-PSMA(HPLC), %I&TRadiochemical177Lu-  0%  0%  0%  0%Purity bycolloid ≤5.0%TLC, %of radioactivityEthanol2.5-4.5%N / AN / AN / AN / Acontent, %(v / v) (GC)ChemicalLu-PSMA I&T -1.2μg / ml1.2μg / ml1.2μg / ml1.1μg / mlpurityconcentration ≤6.0Lu-PSMA I&Tμg / mlAscorbic acid15-35 mg / ml25mg / ml25mg / ml25mg / ml25mg / mlconcentrationmg / ml† The radiometric RT of the test sample = UV RT of Reference Standard ± 5%.TABLE 4DStability Data of 177Lu-PSMA I&T composition 3.STABILITY BATCH #372 h post End of SynthesisVIAL #1234Radioactivity9840MBq9540MBq9530MBq9530MBqFill Volume17.51ml17.01ml16.99ml16.98mlStorage Condition+22.5°C.+32.5°C.≥75% RH+5°C.(Ambient)QC TESTINGValidationcriteriaTestSpecificationVisualClear, colorlessPassPassPassPassinspectionto yellowsolution, novisible particlesRadiochemicalCo-elutes withPassPassPassPassIdentityreferencestandard †pH4.0-5.04.54.54.54.5RadionuclidicGamma ray energy113 keV and113 keV and113 keV and113 keV andIdentification113 ± 2 keV209 keV209 keV209 keV209 keVkeV208 ± 4 keVno otherno otherno otherno other(HPGe-detector)significantsignificantsignificantsignificantNo otherpeakspeakspeakspeakssignificantdetecteddetecteddetecteddetectedpeaks withgamma energy >100keV are detectedRadiochemical≥95.0% as95.8%96.0%96.1%96.0%Purity177Lu-PSMA(HPLC), %I&TRadiochemical177Lu-  0%  0%  0%  0%Purity bycolloid ≤5.0%TLC, %of radioactivityEthanol2.5-4.5%N / AN / AN / AN / Acontent, %(v / v) (GC)ChemicalLu-PSMA I&T -1.0μg / ml0.9μg / ml1.0μg / ml1.0μg / mlpurityconcentration ≤6.0Lu-PSMA I&Tμg / mlAscorbic acid15-35 mg / ml15mg / ml15mg / ml15mg / ml15mg / mlconcentrationmg / ml† The radiometric RT of the test sample = UV RT of Reference Standard ± 5%.TABLE 4EStability Data of 177Lu-PSMA I&T composition 3.STABILITY BATCH #472 h post End of SynthesisVIAL #12345Radioactivity94909600960096009590MBqMBqMBqMBqMBqFill Volume17.1917.4217.4517.4417.42mlmlmlmlmlStorage Condition+22.5°+32.5°+40°+5°+5°C.C.C.C.C.QC TESTINGValidation criteriaTestSpecificationZZZZZVisualClear,PassPassPassPassPassinspectioncolorless toyellowsolution, novisibleparticlesRadiochemicalCo-elutesPassPassPassPassPassIdentitywithreferencestandard †pH4.0-5.04.54.54.54.54.5RadionuclidicGamma ray113 keV113 keV113 keV113 keV113 keVIdentificationenergyandandandandandkeV113 ± 2 keV209 keV209 keV209 keV209 keV209 keV208 ± 4 keVno otherno otherno otherno otherno other(HPGe-significantsignificantsignificantsignificantsignificantdetector)peakspeakspeakspeakspeaksNo otherdetecteddetecteddetecteddetecteddetectedsignificantpeaks withgammaenergy >100keV aredetectedRadiochemical≥95.0% as96.5%95.9%95.8%96.3%96.6%Purity177Lu-PSMA(HPLC), %I&TRadiochemical177Lu-colloid ≤5.0%  0%  0%  0%  0%  0%Purity byof radioactivityTLC, %Ethanol2.5-4.5%N / AN / AN / AN / AN / Acontent, %(v / v) (GC)ChemicalLu-PSMA1.01.01.01.01.0purityI&T -μg / mlμg / mlμg / mlμg / mlμg / mlLu-PSMA I&Tconcentration ≤6.0μg / mlAscorbic acid15-352525252525concentrationmg / mlmg / mlmg / mlmg / mlmg / mlmg / mlmg / ml† The radiometric RT of the test sample = UV RT of Reference Standard ± 5%.TABLE 4FStability Data of 177Lu-PSMA I&T Composition 3.STABILITY BATCH #572 h post End of SynthesisVIAL #1234Radioactivity9930MBq9800MBq9800MBq9810MBqFill Volume19.91ml19.69ml19.68ml19.73mlStorage Condition+22.5°C.+32.5°C.+5°C.+5°C.QC TESTINGValidationcriteriaTestSpecificationVisualClear, colorlessPassPassPassPassinspectionto yellowsolution, novisible particlesRadiochemicalCo-elutes withPassPassPassPassIdentityreferencestandard †pH4.0-5.04.54.54.54.5RadionuclidicGamma ray energy113 keV and113 keV and113 keV and113 keV andIdentification113 ± 2 keV209 keV209 keV209 keV209 keVkeV208 ± 4 keVno otherno otherno otherno other(HPGe-detector)significantsignificantsignificantsignificantNo otherpeakspeakspeakspeakssignificantdetecteddetecteddetecteddetectedpeaks withgamma energy >100keV are detectedRadiochemical≥95.0% as97.0%97.0%96.8%97.3%Purity177Lu-PSMA(HPLC), %I&TRadiochemical177Lu-  0%  0%  0%  0%Purity bycolloid ≤5.0%TLC, %of radioactivityEthanol2.5-4.5%N / AN / AN / AN / Acontent, %(v / v) (GC)ChemicalLu-PSMA I&T-0.9μg / ml0.9μg / ml0.9μg / ml0.9μg / mlpurityconcentration ≤6.0Lu-PSMA I&Tμg / mlAscorbic acid15-35 mg / ml25mg / ml25mg / ml25mg / ml25mg / mlconcentrationmg / ml† The radiometric RT of the test sample = UV RT of Reference Standard ± 5%.TABLE 4GStability Data of 177Lu-PSMA I&T Composition 3.STABILITY BATCH #672 h post End of SynthesisVIAL #14 *Radioactivity9960MBq9800MBqFill Volume19.69ml19.40mlStorage Condition+22.5°C.+40°C.QC TESTINGValidation criteriaTestSpecificationVisual inspectionClear, colorless toPassPassyellow solution, novisible particlesRadiochemicalCo-elutes withPassPassIdentityreference standard†pH4.0-5.04.54.5RadionuclidicGamma ray energy113 keV and113 keV andIdentification113 ± 2 keV209 keV209 keVkeV208 ± 4 keVno other significantno other significant(HPGe-detector)peaks detectedpeaks detectedNo other significantpeaks with gammaenergy >100 keV aredetectedRadiochemical≥95.0% as 177Lu-96.7%95.8%Purity (HPLC), %PSMA I&TRadiochemical177Lu-colloid ≤5.0%  0%  0%Purity by TLC, %of radioactivityEthanol content, %2.5-4.5%N / AN / A(v / v) (GC)Chemical purityLu-PSMA I&T -1.0μg / ml1.0μg / mlLu-PSMA I&Tconcentration ≤6.0μg / mlAscorbic acid15-35 mg / ml25mg / ml25mg / mlconcentrationmg / ml†The radiometric RT of the test sample = UV RT of Reference Standard ± 5%.TABLE 4HStability Data of 177Lu-PSMA I&T composition 3.STABILITY BATCH #772 h post End of SynthesisVIAL #123Radioactivity9870MBq9880MBq9910MBqFill Volume19.31ml19.34ml19.43mlStorage Condition+22.5° C. / +32.5° C. / +5° C. / InvertedInvertedInvertedQC TESTINGValidationcriteriaTestSpecificationVisualClear, colorless toPassPassPassinspectionyellow solution,no visibleparticlesRadiochemicalCo-elutes withPassPassPassIdentityreference standard†pH4.0-5.04.54.54.5RadionuclidicGamma ray113 keV and113 keV and113 keV andIdentificationenergy209 keV209 keV209 keVkeV113 ± 2 keVno otherno otherno other208 ± 4 keVsignificantsignificantsignificant peaks(HPGe-detector)peaks detectedpeaks detecteddetectedNo othersignificant peakswith gammaenergy >100 keVare detectedRadiochemical≥95.0% as 177Lu-96.5%96.4%96.3%Purity (HPLC), %PSMA I&TRadiochemical177Lu-colloid ≤  0%  0%  0%Purity by TLC, %5.0% ofradioactivityEthanol content, %2.5-4.5%N / AN / AN / A(v / v) (GC)Chemical purityLu-PSMA I&T -1.0μg / ml0.9μg / ml1.0μg / mlLu-PSMA I&Tconcentration ≤6.0μg / mlAscorbic acid15-35mg / ml25mg / ml25mg / ml25mg / mlconcentrationmg / ml†The radiometric RT of the test sample = UV RT of Reference Standard ± 5%.TABLE 4IRelease Data from Composition 4 Commercial Scale Development BatchesSpecificationCharacteristics(Composition 4)8017-PD158017-PD168017-PD17AppearanceClear, colorless toPassPassPassyellow solutionwithout visibleparticlespH4.0-4.54.24.24.2Ascorbic Acid28-38mg / mL323335EthanolN / AN / AN / AN / ARadionuclidicGamma ray energy113 keV and113 keV and113 keV andidentification113 ± 1 keV and209 keV209 keV209 keV208 ± 1 keVno otherno otherno othersignificantsignificantsignificantpeakspeakspeaksdetecteddetecteddetectedRadiochemical IdentityRelative retentionPassPassPasstime of 0.70 to 0.75compared to PSMAI&T in HPLCstandardRadiochemical purityNot less than969797by HPLC method(NLT, ≤) 95%Radiochemical purityN / AN / AN / AN / Aby TLC methodUnboundNot more than 0% 0% 0%[177Lu]lutetium(NMT, ≥) 1%PSMA I&T Content3.0-8.0 μg / mL4.55.05.0Radionuclidic purityNot less than (NLT, ≥)100%100%100%99.9%[177Lu]Lu3+177Lu-PSMA-I&TN / AN / AN / AN / ASpecific activityApparent Molar2.0-7.0mCi / nmol4.94.44.5ActivityEndotoxins11.7EU / mLN / AN / AN / ARadioactivity12.0-14.6mCi / mL13.213.313.4ConcentrationSterilitySterileN / AN / AN / ATABLE 4JStability data from composition 4SpecificationCharacteristics(Composition 4)8017-PD158017-PD168017-PD17pH4.0-4.54.34.24.2Ascorbic Acid28-38mg / mL323334Radiochemical purityNot less than959595by HPLC method(NLT, ≤) 95%UnboundNot more than0%0%0%[177Lu]lutetium(NMT, ≥) 1%PSMA I&T Content3.0-8.0μg / mL4.54.85.0Apparent Molar2.0-7.0mCi / nmol4.94.64.5ActivityStability Testing Time>72hours727296Specifications for the [177Lu]Lu-PSMA I&T solution are presented in the Table 5 below. The specifications listed were used as release parameters except for sterility testing. Sterility was tested on all batches post-release.TABLE 5Specifications for [177Lu]Lu-PSMA I&TSpecificationSpecificationSpecificationCharacteristics(Composition 1)(Composition 3)(Composition 4)AppearanceClear, colorless orClear, colorless orClear, colorless toslightly yellowslightly yellowyellow solutionliquid, no visibleliquid, no visiblewithout visibleparticlesparticlesparticlespH5.0-8.04.0-5.04.0-4.5Ascorbic Acid20-70mg / ml15-35mg / ml28-38mg / mLEthanol5.0% to 8.0%2.5% to 4.5%N / ARadionuclidicGamma ray energyGamma ray energyGamma rayidentification113 ± 10 keV and113 ± 10 keV andenergy 113 ± 1208 ± 12 keV208 ± 12 keVkeV and 208 ± 1keVRadiochemical IdentityThe radiometric RTThe radiometric RTRelative retentionof the test sample =of the test sample =time of 0.70 toUV RT ofUV RT of Reference0.75 compared toReference Standard ±Standard ± 5%.PSMA I&T in5%.HPLC standardRadiochemical purity≥95.0%≥95.0%Not less thanby HPLC method(NLT, ≤) 95%Radiochemical purity177Lu-colloid ≤177Lu-colloid ≤ 5.0%N / Aby TLC method5.0%UnboundN / AN / ANot more than[177Lu]lutetium(NMT, ≥) 1%PSMA I&T ContentLu-PSMA I&T -Lu-PSMA I&T -3.0-8.0μg / mLconcentration ≤12.0concentration ≤12.0μg / mLμg / mLRadionuclidic purity≥99.9% of the total≥99.9% of the totalNot less thanactivity of 177Lu atactivity of 177Lu at(NLT, ≥) 99.9%the end of the shelfthe end of the shelf[177Lu]Lu3+lifelife177Lu-PSMA-I&TReportedReportedN / ASpecific activityApparent MolarN / AN / A2.0-7.0mCi / nmolActivityEndotoxins<17.5IU / ml<17.5IU / ml11.7EU / mLRadioactive content90%-110% at the90%-110% at thedate and time stateddate and time statedon the labelon the labelSterilitySterileSterileSterileExample 3: Radiochemical Purity of 177Lu-PSMA I&T in Different Formulations CompositionsThe example demonstrates radiochemical stability of 177Lu-PSMA I&T in formulation compositions at different pH values. The shelf life of 177Lu-PSMA I&T is restricted by high rate of radiolysis during preparation and storage resulting in decomposition of 177Lu-PSMA I&T and formation of radiochemical impurities. This eventually results in radiochemical purity of 177Lu-PSMA I&T solution to fall below acceptance limit of 95.0%.Formation of a particular radiochemical impurity of 177Lu-PSMA I&T have been observed having retention time of about 5.2 minutes by HPLC with Phenomenex Luna C18 column (3 μm, 150 mm×4.6 mm) using 0.1% trifluoroacetic acid in water (Mobile phase A) and 0.1% trifluoroacetic acid in water:acetonitrile (10:90% v / v) (Mobile phase B) and isocratic method of 23% Mobile phase B at temperature of 40° C. The impurity referred herein having retention time of about 5.2 minutes is exemplified in the chromatograms in FIGS. 6A-11B.In experiments conducted previously, lowering formulation radioactivity concentration was sufficient to reduce the formation of the impurity eluting at about 5.2 minutes and maintaining radiochemical stability of [177Lu]Lu-PSMA I&T solutions above 95.0% for 72 hours.In this example, six experiments were conducted where [177Lu]Lu-PSMA I&T was prepared in different formulation compositions with varying ascorbic acid concentration, pH and radioactivity concentration. Product formulation details are described in Table 6.TABLE 6[177Lu]Lu-PSMA I&T formulation compositions evaluatedExperimentFormulationSampleSampleRadioactivityStorageno.compositionpHRadioactivityVolumeConcentrationTemperature1high RAC, 42.5712 810 MBq10 ml1281 MBq / ml22.5° C.mg / ml Ascorbicacid2high RAC, 42.54.512 780 MBq10 ml1278 MBq / ml22.5° C.mg / ml Ascorbicacid3high RAC, 42.53.513 110 MBq10 ml1311 MBq / ml22.5° C.mg / ml Ascorbicacid4low RAC, 314.511 580 MBq20 ml 579 MBq / ml22.5° C.mg / ml Ascorbicacid5low RAC, 31512 520 MBq20 ml 626 MBq / ml22.5° C.mg / ml Ascorbicacid6low RAC, 314.511 770 MBq20 ml 589 MBq / ml22.5° C.mg / ml AscorbicacidHigh radioactivity concentration (high RAC) in sample solutions were 1278 MBq / ml, 1281 MBq / ml and 1311 MBq / ml measured at the end of production. Low radioactivity concentration (low RAC) in sample solutions were 579 MBq / ml, 589 MBq / ml and 626 MBq / ml measured at the end of production. Radiochemical purity of each solution was followed by HPLC up to 71-93 hours post-radiolabeling. All solutions were stored at 22.5° C.FIG. 5 shows results of radiochemical purity analyses at different time points determined by HPLC.FIG. 6A and FIG. 6B show HPLC radio-chromatograms of experiment 1 at 0 and 71 hours post EOS, respectively.FIG. 7A and FIG. 7B show HPLC radio-chromatograms of experiment 2 at 0 and 71 hours post EOS, respectively.FIG. 8A and FIG. 8B show HPLC radio-chromatograms of experiment 3 at 0 and 90 hours post EOS, respectively.FIG. 9A and FIG. 9B show HPLC radio-chromatograms of experiment 4 at 0 and 92 hours post EOS, respectively.FIG. 10A and FIG. 10B show HPLC radio-chromatograms of experiment 5 at 0 and 71 hours post EOS, respectively.

[0431] FIG. 11A and FIG. 11B show HPLC radio-chromatograms of experiment 6 at 0 and 93 hours post EOS, respectively.

[0432] The radiochemical stability results for each experiment at different time points are provided in Tables 5-10.TABLE 5Experiment 1Radiochemical purity by HPLC (hours post EOS)T = 0 hT = 24 hT = 46 hT = 64 hT = 71 h99.0%96.5%93.3%N / A91.2%TABLE 6Experiment 2Radiochemical purity by HPLC (hours post EOS)T = 0 hT = 24 hT = 46 hT = 67 hT = 71 h99.4%98.0%96.7%95.3%95.2%TABLE 7Experiment 3Radiochemical purity by HPLC (hours post EOS)T = 0 hT = 24 hT = 46 hT = 64 hT = 72 hT = 90 h99.1%97.7%96.5%N / AN / A94.5%TABLE 8Experiment 4Radiochemical purity by HPLC (hours post EOS)T = 0 hT = 19 hT = 46 hT = 71 hT = 92 h99.4%98.3%97.5%96.8%96.0%TABLE 9Experiment 5Radiochemical purity by HPLC (hours post EOS)T = 0 hT = 25 hT = 47 hT = 71 h99.2%98.4%97.3%96.5%TABLE 10Experiment 6Radiochemical purity by HPLC (hours post EOS)T = 0 hT = 20 hT = 44 hT = 69 hT = 93 h99.1%98.7%98.0%97.4%97.0%In the example, formulation composition pH had a considerable effect on the radiochemical stability of 177Lu-PSMA I&T and more specifically in the formation of radiochemical impurity eluting at about 5.2 minutes as exemplified in FIGS. 6A-11B. In high RAC solutions, the decrease in radiochemical purity over time at pH 4.5 was two times slower than at pH 7.Further decrease of formulation pH to 3.5 did not show measurable improvement in radiochemical stability compared to pH 4.5 solution. It is possible that ascorbic acid solution at pH 4.5, being near pKa value of ascorbic acid, already possesses sufficient quantity of protons to serve as inhibitors against radiolysis of 177Lu-PSMA I&T and reduce formation of the radiochemical impurity eluting at about 5.2 minutes.Incorporation of solution pH of 4.5 in the lower RAC formulation further improved radiochemical stability of 177Lu-PSMA I&T. In the lower RAC formulation, change in formulation pH from 5 to 4.5 had similar effect on radiochemical stability as increasing ascorbic acid concentration from 21 mg / ml to 31 mg / ml.The radiochemical purity of a 10 ml high RAC 177Lu-PSMA I&T formulation composition comprising 42.5 mg / ml ascorbic acid is at least about 99% at 0 hours post EOS and at least about 93.3% at 46 hours post EOS, as measured by HPLC. The radiochemical purity decreases as the pH of the formulation is increased from pH 4.5.The radiochemical purity of a 20 ml low RAC 177Lu-PSMA I&T formulation comprising 31 mg / ml ascorbic acid is at least about 99.1% at 0 hours post EOS as measured by HPLC. The rate in which the radiochemical purity decreases over time is slower for low RAC 177Lu-PSMA-I&T formulations having a pH of 4.5 compared to a pH of 5.

[0438] The results demonstrate that, formulation composition pH of 5 or below can substantially reduce formation of radiochemical impurity eluting at about 5.2 minutes and therefore enhance radiochemical stability of 177Lu-PSMA I&T compared to formulation compositions at pH above 5. In addition, radiochemical stability of 177Lu-PSMA I&T can further be improved by incorporation of lower solution RAC. In the example, 177Lu-PSMA I&T solution showed highest radiochemical stability in low RAC solution of pH 4.5 and ascorbic acid concentration of 31 mg / ml. This formulation is considered a preferred composition to minimize formation of radiochemical impurities and to maintain radiochemical stability of 177Lu-PSMA I&T above 95.0% for 72 hours or longer.Example 4: Effects of Treatment with Both 177Lu-PSMA-617 and 177Lu-PSMA-I&T Compared to Third Line TreatmentDosimetry for 177Lu-PSMA I&T

[0439] There was no major difference in absorbed dose estimates between 177Lu-PSMA I&T and 177Lu-PSMA-617. The specific known dosimetry for 177Lu-PSMA I&T is presented below.

[0440] For normal organs, the mean whole-body effective dose for all cycles was 0.41±0.18 Sv (0.06 Sv / GBq). The mean absorbed organ doses were 5.3±1.6 Gy (0.72 Gy / GBq) for the kidneys; 0.89±0.42 Gy (0.12 Gy / GBq) for the liver; and 4.0±1.1 Gy (0.55 Gy / GBq) for the parotid, 4.8±2.8 Gy (0.64 Gy / GBq) for the submandibular, and 27±10 Gy (3.8 Gy / GBq) for the lacrimal glands.

[0441] No substantial difference for absorbed doses of normal organs were observed when comparing them with respect to cycle number (Table 13). The mean organ masses underlying these absorbed dose estimates were 1.595±307 g (range, 1,165-2,373 g) for the liver, 153±29.9 g (range, 88.4-218.7 g) for the kidneys, 19.1±5.7 g (range, 8.0-35.6 g) for the parotid, 8.2±1.9 g (range, 4.2-14.3 g) for the submandibular, and 0.45±0.12 g (range, 0.25-0.78 g) for the lacrimal glands. For paired organs, masses from both sides were summed.

[0442] For tumor lesions, all lesions received a mean dose per cycle of 23±20 Gy (3.3 Gy / GBq). Mean absorbed doses for bone, lymph node, liver, and lung metastases were 26±20 Gy (3.4 Gy / GBq), 24±16 Gy (3.2 Gy / GBq), 8.5±4.7 Gy (1.28 Gy / GBq), and 13±7.4 Gy (1.7 Gy / GBq).

[0443] The values (mean, SD, and ranges) for the corresponding absorbed doses per GBq for normal organs and tumor lesions are presented in the tables below, respectively.TABLE 11Effective Dose for Whole Body in Sv / GBq and Absorbed Doses for NormalOrgans in Gy / GBq.CyclesWholeParotidSubmandibularLacrimalinvestigatedbodyKidneys*Liverglands*glands*glands*Overall (n = 34)Mean ± SD0.06±0.72 ± 0.210.12 ± 0.060.55±0.64 ± 0.403.8 ± 1.4Range0.02-0.110.33-1.220.05-0.260.25-0.840.24-1.701.68-7.03First cycle (n = 15)Mean ± SD0.05±0.71 ± 0.250.12 ± 0.070.56±0.54 ± 0.293.8 ± 1.5Range0.02-0.110.33-1.220.05-0.260.25-0.840.25-1.351.68-7.03Second cycle (n = )Mean ± SD0.06±0.75 ± 0.190.13 ± 0.050.59±0.71 ± 0.424.1 ± 1.1Range0.03-0.110.44-1.010.08-0.210.47-0.800.40-1.702.44-5.56Third cycle (n =Mean ± SD0.06±0.73 ± 0.220.12 ± 0.060.49±0.83 ± 0.593.5 ± 1.4Range0.03-0.100.42-0.930.07-0.210.32-0.640.33-1.682.41-5.04Fourth cycle (nMean ± SD0.05±0.69 ± 0.180.11 ± 0.040.50±0.66 ± 0.533.4 ± 1.7Range0.03-0.110.45-0.950.07-0.170.32-0.580.24-1.581.75-5.35 indicates data missing or illegible when filedTABLE 12Absorbed Doses for Tumor Lesions in Gy / GBqBoneLymph nodeLiverLungCycles investigatedAll metastasesmetastasesmetastasesmetastasesmetastasesOverall (n)9374883Mean ± SD3.2 ± 2.63.4 ± 2.73.2 ± 2.21.2 ± 0.671.75 ± 0.92Range 0.22-12.03 0.22-12.031.63-8.460.47-2.590.94-2.68First cycle (n)4133521Mean ± SD3.5 ± 2.93.8 ± 3.12.6 ± 0.891.72.7Range 0.22-12.03 0.22-12.031.63-3.760.85-2.59Second cycle (n)2621221Mean ± SD3.3 ± 2.53.4 ± 2.45.20.941.3Range0.70-8.461.03-9.591.98-8.460.70-1.17Third cycle (n)1410121Mean ± SD2.7 ± 2.33.2 ± 2.52.60.950.94Range0.94-7.991.11-7.9918.870.47-1.42Fourth cycle (n)12102Mean ± SD2.4 ± 2.22.7 ± 2.31.13Range0.74-7.601.04-7.600.74-1.51There is a clear trend toward a lower absorbed dose with an increasing number of the cycle. Mean absorbed dose per lesion was 26±21 Gy (3.5 Gy / GBq) for the first, 24±19 Gy (3.3 Gy / GBq) for the second, 20±18 Gy (2.7 Gy / GBq) for the third, and 18±17 Gy (2.4 Gy / GBq) for the fourth cycle. A similar trend can be seen for the subgroup of bone metastases. No reliable comparison is possible for lymph node, liver, and lung metastases because of a low sample number. See the below table for the effective half-lives and mean absorbed doses of 177Lu-PSMA I&T.

[0445] 177Lu-PSMA RLT, the study included both 177Lu-PSMA-617 and 177Lu-PSMA I&T, had better effects and caused less adverse effects than third-line treatment. Twelve studies including 669 patients reported 177Lu-PSMA RLT. Overall, 44% of the patients had a maximum decline of PSA of ≥50% following treatment with 177Lu-PSMA RLT. The treatment with 177Lu-PSMA-617 and 177Lu-PSMA for imaging and therapy (I&T) had mainly transient adverse effects. Sixteen studies including 1338 patients reported third-line treatment. Overall, 21% of the patients had a best decline of PSA of ≥50% following third-line treatment. After third-line treatment with enzalutamide and cabazitaxel, adverse effects caused discontinuation of treatment for 10% to 23% of the patients. 177Lu-PSMA RLT gave a best PSA decline ≥50% more often than third-line treatment (mean 44% versus 22%, p=0.0002, t-test). 177Lu-PSMA RLT gave objective remission more often than third-line treatment (overall 31 of 109 patients versus 43 of 275 patients, p=0.004, χ2 test). Median survival was longer after 177Lu-PSMA RLT than after third-line treatment, but the difference was not statistically significant (mean 14 months versus 12 months, p=0.32, t-test). Adverse effects caused discontinuation of treatment more often for third-line treatment than for 177Lu-PSMA RLT (22 of 66 patients versus 0 of 469 patients, p<0.001, χ2 test).

[0446] The aim of this investigational medical product dossier (IMPD) is to provide a scientific and ethical platform for this useful treatment with 177Lu-PSMA I&T to initially pursue its application, preferably in academic centers and under controlled investigational protocols. There are not existing guidelines except for 177Lu-PSMA-617. The information in this IMPD is based on the newest literature and existing best experience from the nuclear medicine centers who have been treating PC patients with this modality.

[0447] The synthesis is a one-step labelling process with injections grade ethanol and water used as the only solvents. Therefore, no residual solvents are present. Radiochemical impurities are quantified by chromatographical methods (HPLC and TLC). Radiochemical purity may not be less than 95.0%.Example 5: A Multi-Center, Open-Label, Randomized Phase 3 Trial Comparing the Safety and Efficacy of 177Lu-PSMA I&T

[0448] A Multi-Center, Open-Label, Randomized Phase 3 Trial was conducted comparing the safety and efficacy of the composition comprising 177Lu-PSMA I&T versus hormone therapy in patients with Metastatic Castration-Resistant Prostate Cancer.

[0449] This study aims to identify and characterize the safety and efficacy of using 177Lu-PSMA I&T in the treatment of adult male human patients (men) with metastatic Castration-Resistant Prostate Cancer (mCRPC) who progress despite treatment with one course of standard of care hormone therapy.

[0450] 177Lu-PSMA I&T is a radioactive therapeutic agent that specifically targets the prostate specific membrane antigen proteins that are expressed on metastatic prostate cancer cells.

[0451] In this study, 177Lu-PSMA I&T is provided as a sterile, filtered radiopharmaceutical solution that contains a microdose of 177Lu-PSMA I&T in an aqueous ascorbic acid and ethanol solution.

[0452] Patients randomized to be treated in accordance with the standard of care hormone therapy for mCRPC will be treated either with abiraterone acetate in combination with prednisone, or enzalutamide based on the Investigator's independent medical judgment.

[0453] Abiraterone acetate is indicated in combination with prednisone for the treatment of patients with metastatic castration-resistant prostate cancer (mCRPC) or metastatic high-risk castration-sensitive prostate cancer (mCSPC). Abiraterone acetate is converted in vivo to abiraterone, an androgen biosynthesis inhibitor, that inhibits 17 α-hydroxylase / C17,20-lyase (CYP17). This enzyme is expressed in testicular, adrenal, and prostatic tumor tissues and is required for androgen biosynthesis.

[0454] Enzalutamide is an androgen receptor inhibitor indicated for the treatment of patients with CRPC or mCSPC (Metastatic Castration-Sensitive Prostate Cancer). Enzalutamide has been shown to competitively inhibit androgen binding to androgen receptors and, consequently, inhibits nuclear translocation of androgen receptors and their interaction with DNA.A. Study Objectives and Endpoints

[0455] The primary objective of this study is to prospectively assess the efficacy of 177Lu-PSMA I&T on the improvement of radiographic progression-free survival (rPFS) as determined by PCWG3-modified RECIST 1.1 in men with metastatic Castration-Resistant Prostate Cancer (mCRPC) compared to standard of care hormone therapy. The endpoint of this objective is the time from randomization to radiographic progression as determined by Prostate Cancer Working Group 3 (PCWG3) criteria as assessed by blinded independent central review.

[0456] The secondary objective is to assess if 177Lu-PSMA I&T improves overall survival (OS) in patients with mCRPC compared to those treated with standard of care hormone therapy. The endpoint of this objective is the time from randomization to death by any cause.

[0457] Other secondary objectives and endpoints include:

[0458] Objective: evaluate the improvement in overall survival (OS) in men with mCRPC treated with 177Lu-PSMA I&T compared to hormone therapy; Endpoint: time from randomization to the second radiographic progression as determined by PCWG3 or RECIST 1.1 by BICR (Blinded Independent Central Review) after crossover.

[0459] Objective: assess changes in the time to second radiographic progression for patients who crossover from the standard of care hormone therapy arm to the 177Lu-PSMA I&T treatment arm; Endpoint: time from randomization to the second radiographic progression as determined by PCWG3 or RECIST 1.1 by BICR after crossover,

[0460] Objective: identify changes in progression-free survival (PFS, composite) following 177Lu-PSMA I&T radioligand therapy compared to standard of care hormone therapy; Endpoint: time from randomization to progression (PFS, composite) based on the following events, whichever occurs first: PCWG3 or RECIST progression, clinical / symptomatic progression and / or pain progression, or death due to any cause as determined by investigator.

[0461] Objective: identify changes in progression-free survival 2 (PFS2, composite) following 177Lu-PSMA I&T radioligand therapy compared to standard of care hormone therapy; Endpoint: time from randomization to the second progression (PFS, composite) based on the following events, whichever occurs first: PCWG3 or RECIST progression, clinical / symptomatic progression and / or pain progression, or death due to any cause as determined by investigator,

[0462] Objective: assess changes in PSA50 (Response Rate of Patients with a reduction of PSA≥50% from Baseline) response rate following 177Lu-PSMA I&T radioligand therapy compared to standard of care hormone therapy; Endpoint: PSA50 response rate, defined as a confirmed reduction of PSA from baseline of ≥50%,

[0463] Objective: determine the impact of 177Lu-PSMA I&T compared to standard of care hormone therapy on skeletal symptoms; Endpoint: time from randomization to first symptomatic skeletal event (SSE-free survival),

[0464] Objective: determine the impact of 177Lu-PSMA I&T compared to standard of care hormone therapy on radiographic soft-tissue progression; Endpoint: time from randomization to radiographic soft tissue progression (rSTP) as measured by RECIST 1.1 by BICR,

[0465] Objective: assess changes in use of chemotherapy following 177Lu-PSMA I&T compared to standard of care hormone therapy; Endpoint: time from randomization to first use of chemotherapy, and

[0466] Objective: evaluate the impact on quality-of-life following 177Lu-PSMA I&T radioligand therapy to hormone therapy; Endpoint: Quality of Life improvement based on EORTC QLQ-C30 questionnaire.

[0467] Exploratory objectives and endpoints are:

[0468] Objective: evaluate any differences in objective response rate and disease control rate with 177Lu-PSMA I&T compared to standard of care hormone therapy; Endpoint: objective response rate based on PCWG3 criteria and disease control rate (DCR-complete / partial response and stable disease),

[0469] Objective: evaluate changes in time to PSA progression following 177Lu-PSMA I&T radioligand therapy compared to standard of care; Endpoint: time from randomization to PSA progression, defined as a rise in PSA of ≥25% from the post-treatment nadir, and

[0470] Objective: assess the duration of response (DoR) in patients who achieve complete or partial response following 177Lu-PSMA I&T radioligand therapy compared to hormone therapy; Endpoint: the time from complete or partial response to radiographic progression.B. Study Design(i) Overview and Rationale

[0471] This is an open-label, randomized, multicenter Phase 3 study of 177Lu-PSMA I&T radioligand therapy compared to hormone therapy in men with mCRPC who have been previously treated with androgen receptor (AR)-directed therapy. The hormone therapy regimens for this study are enzalutamide or abiraterone with prednisone based on NCCN guidelines. Selection of the specific regimen will be based on a switch from the patient's previous ADRT for patients randomized to receive standard of care. Based on the published literature, 177Lu-PSMA I&T radioligand therapy has encouraging anti-tumor activity in men with mCRPC and is associated with a favorable safety profile.

[0472] The study consists of a Screening Phase, a Treatment Phase, and a Post-Treatment Follow-up Phase. The study employs a 2:1 randomization into the following treatment groups: (1) 177Lu-PSMA I&T radioligand therapy, or (2) Standard of Care hormone therapy. Standard of care hormone treatment options are abiraterone with prednisone or enzalutamide, with the specific choice based on the Investigator's clinical judgment. Patients randomized to the hormone therapy arm will be given the option to crossover to the radioligand therapy arm upon documentation of radiographic progression.

[0473] Patients will be followed for safety and efficacy as per the schedule of activities and will remain on study treatment until documented radiographic progression occurs as assessed by a blinded independent central review (BICR) or the development of unacceptable toxicity. Patients discontinuing treatment due to documented radiographic progression will enter the Long-term Follow-up Phase. Patients discontinuing treatment prior to documented radiographic progression will continue to have scheduled disease assessments every three months until documented radiographic progression.

[0474] In addition, a sub-study is conducted under this protocol in patients randomized to receive 177Lu-PSMA I&T radioligand therapy to evaluate the pharmacokinetic and radiation dosimetry (as discussed in Example 4 above).

[0475] Due to the nature of the treatments, the identity of the test and control treatments will be known to the Investigators, research staff, and patients. Blinding of this study is not feasible. Immediately following Investigator determination of progressive disease for progressing patients and following the completion of the study for non-progressing patients, blinded radiographic images will be read and interpreted by a panel of up to three trained independent radiologists without access to clinical information or treatment groups for assessing the overall response rate to treatment.

[0476] The severity of AEs and SAEs will be graded based upon the subject's symptoms in accordance with the Common Terminology Criteria for Adverse Events (CTCAE), Version 5.0. AEs that are not defined in the CTCAE current version should be evaluated for severity in accordance with the following scale:

[0477] Grade 1=Mild: transient or mild discomfort, no limitation in activity, no medical intervention / therapy required.

[0478] Grade 2=Moderate: mild to moderate limitation in activity, some assistance may be needed, no or minimal medical intervention / therapy required

[0479] Grade 3=Severe: marked limitation in activity, some assistance usually required, medical intervention / therapy required, hospitalization possible

[0480] Grade 4=Life-threatening: extreme limitation in activity, significant assistance required, significant medical intervention / therapy required, hospitalization or hospice care probable

[0481] Grade 5=Death: the event results in death

[0482] It is important to distinguish between serious and severe AEs. Severity is a measure of intensity, whereas seriousness is defined by the criteria outlined in Section 10.3. An AE of severe intensity may not be considered serious. Seriousness, not severity, serves as a guide for defining regulatory obligations.(ii) Selection of the Primary Endpoint

[0483] Metastatic castration-resistant prostate cancer is generally considered a late stage in the natural progression of prostate cancer. Although mCRPC is usually associated with an unfavorable prognosis, many patients experience a more indolent disease progression resulting in a larger range of overall survival with approximately 15% of men with mCRPC surviving beyond 5 years (Moreira et al., Clin Genitourin Cancer, 2017; 15 (1): 60-66).

[0484] In consideration of the relatively large range of overall survival in men with mCRPC, radiographic progression-free survival using RECIST 1.1 (soft tissue lesion status), and Prostate Cancer Working Group 3 (PCWG3) criteria (bone lesion status), as assessed by blinded independent central review, was chosen as the primary endpoint for this study. Overall survival is a secondary endpoint of the study, and patients will be followed for overall survival for a period of 5 years after enrollment.(iii) Study Outcomes

[0485] The primary efficacy outcome is radiographic progression-free survival. Once radiographic progression is confirmed by the BIRC, study treatments will be discontinued. Patients will then enter the Follow-up Phase of the trial to assess overall survival for a 5-year follow-up period from the date of enrollment in the study.

[0486] Safety will be assessed until the end of treatment and one-month follow-up period by assessing the following safety parameters: adverse events, vital signs, changes in concomitant medications / therapies, changes in physical examination, and clinical laboratory measurements.C. Patient Selection(i) Study Population

[0487] The study population will include patients with mCRPC with progressive disease based on PCWG3 modified RECIST 1.1 criteria.(ii) Inclusion Criteria Include:1. Male 18 years or older.

[0489] 2. Histologically or pathologically confirmed prostate adenocarcinoma without predominant small cell component.

[0490] 3. Progressive disease by one or more of the following criteria:

[0491] a. Serum / plasma PSA progression defined as 2 consecutive increases in PSA over a previous reference value measured at least 1 week apart with a minimum start value of >2 ng / mL.

[0492] b. Progression of measurable disease (RECIST 1.1) or presence of at least two new bone lesions (PCWG3 criteria)

[0493] 4. Previous treatment with next-generation androgen receptor (AR)-directed therapy (e.g. abiraterone, enzalutamide, apalutamide, darolutamide).

[0494] a. Must have received no more than one previous AR-directed therapy.

[0495] b. Must have been administered ARAT (abiraterone, enzalutamide, darolutamide, or apalutamide) in the castration-sensitive or castration-resistant setting.

[0496] c. Must have progressed while on ARAT.

[0497] 5. PSMA-PET scan (e.g., [68Ga]Ga-PSMA-11 or [18F]DCFPyL) positive as determined by central reader.

[0498] 6. Effective castration with serum testosterone level of <50 ng / dL and plan to continue with chronic medical or surgical castration.

[0499] 7. Patients with HIV that are healthy and with a low risk of acquired immune deficiency syndrome related outcomes may participate in the study at the investigators' discretion.

[0500] 8. Patients with HBV and HCV may also participate if symptoms are sufficiently managed.

[0501] 9. Life expectancy of at least 6 months as assessed by investigator.

[0502] 10. Willing to initiate ARAT therapy determined by investigator.(iii) Exclusion Criteria Include:

[0503] 1. Prior treatment with radioligand therapy including other lutetium-labeled compounds.

[0504] 2. Prior treatment with radium-223 (Xofigo) within the past 12 weeks.

[0505] 3. Prior chemotherapy treatment for castration-sensitive or castration-resistant prostate cancer (docetaxel or cabazitaxel).

[0506] 4. Eastern Cooperative Oncology Group (ECOG) performance status (PS) ≥2.

[0507] 5. Patients with known HRR (Haploid relative risk) gene-mutation who have not been previously treated with olaparib or rucaparib.

[0508] 6. Other concurrent cytotoxic chemotherapy, immunotherapy, radioligand therapy, or investigational therapy.

[0509] 7. Inadequate organ and bone marrow function as evidenced by:

[0510] a.Hemoglobin<8⁢ g / dL.b.Absolute⁢ neutrophil⁢ count<1.5×109 / L.c.Platelet⁢ count<100×109 / L.d. AST / SGOT and / or ALT / SGPT>3.0×ULN (wherein: “AST” is Aspartate aminotransferase, “SGOT” is Serum glutamic-oxaloacetic transaminase, “SGPT” is Serum glutamic-pyruvic transaminase, and “ALT” is Alanine aminotransferase).e. Total bilirubin>2×ULN (Upper Limit of Normal) unless patient has known Gilbert's syndrome and then may be 3×ULN.f. Creatinine clearance (CrCl)<50 mL / min based on the Cockcroft-Gault equation.

[0516] g.Albumin≥2.75 g / dL.8. Patients who undergo a transfusion for the sole purpose of meeting eligibility for this study.

[0518] 9. Use of an investigational therapeutic drug within the last 4 weeks prior to start of study treatment or scheduled to receive one during the study period.

[0519] 10. Known CNS metastasis unless received therapy, asymptomatic and neurologically stable.

[0520] 11. Patients receiving zoledronic acid for bone-targeted therapy must be on stable dose for 4 weeks prior to randomization.

[0521] 12. Patients with active significant cardiac disease

[0522] 13. Participants with symptomatic cord compression or clinical / radiological findings indicating impending spinal cord compression.

[0523] 14. Patients with a superscan seen on baseline bone scan as determined by investigator.

[0524] 15. Active malignancy other than low-grade non-muscle-invasive bladder cancer and non-melanoma skin cancer.

[0525] 16. Previous use of G-CSF (Granulocyte-colony stimulating factor) for persistent neutropenia after standard of care treatment.

[0526] 17. Participants with active Covid19. Recovered patients may be included when completely recovered (no symptoms at least 28 days before study medication and a negative Covid test within 72 hours).D. Investigational Product Dosage, Route of Administration, and Dosing Schedule. (i) 177Lu-PSMA I&T

[0527] The medicinal product is a sterile filtered radiopharmaceutical solution that contains a microdose of 177Lu-PSMA I&T formulated in an aqueous solution containing ascorbic acid and ethanol. The product contains a standard activity of approximately 200 mCi at the time of expiry with a standard concentration of approximately 27 mCi / mL at end of production; therefore, the final volume of the dose vial is adjusted to between 7.0 and 10.0 mL in order to provide the required amount of radioactivity at the date and time of infusion. 177Lu-PSMA I&T injection is supplied as a sterile solution in a single-dose vial. The septum is sealed with a crimped aluminum cap. The glass vial containing the radiopharmaceutical is kept in a lead shielded container until use. 177Lu-PSMA I&T is stored at 25° C.; excursions between 15° C.-30° C. are permitted. The shield label will state the expiration date and time for each vial shipped to the clinical sites.(ii) Standard of Care Hormone Treatments

[0528] Standard of care hormone treatments are:

[0529] Abiraterone Acetate with Prednisone: Abiraterone acetate is a CYP 17 inhibitor used in combination with prednisone or methylprednisone. Prednisone is a glucocorticoid. Glucocorticoids are adrenocortical steroids that are readily absorbed from the gastrointestinal tract.

[0530] Enzalutamide is an androgen receptor inhibitor.(iii) Preparation

[0531] All infusion solutions will be prepared and dispensed by the site prior to administration. The preparation of solutions should be performed under aseptic conditions, and final solutions should be inspected visually for particulate matter. If an insoluble precipitate is observed, the solution should be discarded.

[0532] 177Lu-PSMA I&T injection solution is administered as supplied. The radioactivity in the vial should be measured in a calibrated radiation dose calibrator prior to, and after administration to the patient. The administered dose should then be calculated and recorded.(iv) Dosing and Administration

[0533] Patients will be randomized 2:1 to receive either 177Lu-PSMA I&T radioligand therapy or standard of care hormone therapy.

[0534] 177Lu-PSMA I&T Administration: Patients randomized to receive radioligand therapy will receive a single intravenous radioactive dose of 200 mCi (7.4 GBq)±10% of 177Lu-PSMA I&T at the beginning of each treatment cycle.

[0535] An intravenous line should be established prior to administration of 177Lu-PSMA I&T. The 177Lu-PSMA I&T will be injected as a slow bolus over a minimum of 10 to 15 minutes using the site's standard radioligand therapy administration procedures. The patient should be encouraged to void as frequently as possible and drink two liters of liquid daily for two days following 177Lu-PSMA I&T administration.

[0536] Cooling of the patients' salivary glands should be performed by placing ice packs over the parotid and submandibular glands for 30 minutes prior to and up to 4 hours after the injection of 177Lu-PSMA I&T to reduce the risk of salivary gland radiation injuries.

[0537] A six-week treatment cycle will be used for injection of 177Lu-PSMA I&T for 4 treatment cycles or until radiographic progression of disease is determined based on the BIRC assessment of radiographic images (maximum 18 weeks of treatment). Alternatively an eight-week treatment cycle may be used for injection of 177Lu-PSMA I&T for 6 treatment cycles or until radiographic progression of disease is determined based on the BIRC assessment of radiographic images (maximum 18 weeks of treatment).

[0538] The dosing cycle for 177Lu-PSMA I&T may be extended based on evaluation of dose-limiting toxicity experienced by a patient. Dose-limiting toxicity is defined as grade 3 or 4 bone marrow toxicity or grade 2 or greater salivary gland toxicity. For grade 3 or 4 bone marrow toxicity, dosing may resume when improvement to grade 2 or better is observed. For grade 2 or greater salivary gland toxicity, dosing may resume upon improvement to grade 1 toxicity.

[0539] In addition, the 177Lu-PSMA I&T dose should be held and / or reduced to 160 mCi (5.9 GBq)±10% if dose-limiting toxicity is noted. The following dose hold / reductions should be implemented accordingly:

[0540] For grade ≥3 Anemia: Hold dose until return to baseline or Grade≤2 and then reduce to 160 mCi (5.9 GBq) for next cycle

[0541] For grade ≥2 Neutropenia: Hold until return to baseline or Grade≤1

[0542] For grade ≥2 Thrombocytopenia: Hold until return to baseline or Grade≤1 and reduce dose to 160 mCi (5.9 GBq) for next cycle

[0543] For grade ≥3 Non-platelet hematological toxicity: Hold until return to baseline or Grade≤2 and reduce dose to 160 mCi (5.9 GBq) for the next cycle

[0544] For cases of acute renal toxicity that is Grade 3 or higher, dose should be held for next cycle. Dose may be reinstated upon return to baseline or Grade≤2 but reduced to 160 mCi (5.9 GBq) for all remaining doses.

[0545] Dosing cycle extensions of an additional six weeks and dose reduction modifications to 160 mCi (5.9 GBq) for remaining cycles should be initiated for any other Grade 3 or higher non-hematological toxicity related to 177Lu-PSMA I&T as determined by the Investigator. Dosing cycle and dose level may be returned to every six weeks when toxicity returns to a Grade 2 or below.

[0546] For all grade 3 and 4 AEs, patients will only be able to have a 1-time reduction in dose. If the event persists, the patient would need to permanently discontinue from study treatment.

[0547] For grade 2 AEs, only 2 dose reductions are permitted. If the event persists the patient would need to permanently discontinue from study treatment.

[0548] Abiraterone Acetate with Prednisone: The dose of abiraterone acetate should be administered per package insert. Per Abiraterone package insert, for patients with baseline moderate hepatic impairment, the starting dose of abiraterone should be reduced to 250 mg daily. For patients who develop hepatoxicity during treatment, dosing with abiraterone acetate should be suspended until recovery. Retreatment may be initiated at a reduced dose. Abiraterone acetate treatment should be discontinued in patients that develop severe hepatotoxicity.

[0549] Enzalutamide: The dose of enzalutamide is 160 mg (four 40 mg capsules) administered orally once daily. Capsules should be swallowed whole and can be taken with or without food. Per enzalutamide package insert, if a patient experiences a ≥Grade 3 toxicity or an intolerable side effect, dosing should be withheld for one week or until symptoms improve to ≤Grade 2, then resumed at the same or a reduced dose (80 or 80 mg) if warranted.(v) Duration of Study Treatment

[0550] Patients will be treated until radiographic progressive disease, clinical / symptomatic progression, unacceptable / unmanageable toxicity, or patient's refusal of further study treatment (i.e., withdrawal of consent). All patients will be followed while on study treatment and after completion of study treatment during follow-up period: until death, the study cut-off date (which is a minimum of 22 weeks post-enrollment), or withdrawal of consent, whichever comes first. Long-term follow-up with all patients will be five years from enrollment or until death or loss to follow-up.E. Study Procedures and Evaluations

[0551] Trial evaluations and time points are summarized in the Schedule of Activities in Tables 13 and 14.TABLE 13Schedule of Events for 177Lu-PSMA-I&T Arm.Treatment PhasePost-treatment PhaseScreeningCycle 1Cycle 2Cycle 3Cycle 4EOTLTFUWeek (±7 days)−4 to 00468121618202224-256USInformed ConsentXDemographicsXInclusion / ExclusionXCriteriaMedical HistoryXPSMA PETXCT and Bone ScanaXXXXa177Lu-PSMA-I&TXXXXTreatmentHematologyXXXXXXXXBlood ChemistryXXXXXXXXPSAXXXXXECOGXXPhysical ExamXXXXVital SignsXXXX12-Lead ECGXXConcomitantXXXXXXXXXXXMedicationsEORTCXXXXXXXFACT-PXXXXXXXBPI-SFXXXXXXXAdverse EventsXXXXXXXXXXXXProgressionbXXXXSurvivalXEOT = End of Treatment;LTFU = Long-Term Follow Up;US = UnscheduledaCT / Bone scan will be performed every 8 weeks throughout treatment until week 24, and then, if no progression, every 12 weeks continued in LTFU.bPer section 8.5, progression assessments to be conducted every 12 weeks throughout LTFU until radiographic evidence of disease progression is notedTABLE 14Schedule of Events for Standard of Care Hormone Therapy Arm.ScreeningTreatment PhaseEOTLTFUWeek (±7 days)−4 to 00481216202224-256USInformed ConsentXDemographicsXInclusion / ExclusionXCriteriaMedical HistoryXPSMA PETXCT and Bone ScanaXXXXaAbiraterone orDailyEnzalutamideTreatmentHematologyXXXXXXXXBlood ChemistryXXXXXXXXPSAXXXXXECOGXXPhysical ExamXXXXVital SignsXXXX12-Lead ECGXConcomitantXXXXXXXXXMedicationsEORTCXXXXXXXFACT-PXXXXXXXBPI-SFXXXXXXXAdverse EventsXXXXXXXXXXProgressionbXXXXSurvivalXEOT = End of Treatment;LTFU = Long-Term Follow Up;US = UnscheduledaCT / Bone scan will be performed every 8 weeks throughout treatment until week 24, and then, if no progression, every 12 weeks continued through LTFU.bProgression assessments to be conducted every 12 weeks throughout LTFU until radiographic evidence of disease progression is noted(i) Clinical AssessmentsClinical assessments include demographics, medical history, physical examination, vital signs, performance status, adverse events, concomitant medications / therapies, tumor assessments, and Blinded Independent Central Review (BICR).

[0553] For performance status, the Eastern Cooperative Oncology Group (ECOG) performance status scale will be used and will be assessed at Screening and every subsequent clinic visit as shown below in Table 15:TABLE 15Eastern Cooperative Oncology Group (ECOG) performance status scale / GradeActivity Level0Fully active, able to carry on all pre-disease performance without restriction.1Restricted in physically strenuous activity but ambulatory and able to carryout work of light or sedentary nature (e.g., light housework, office work).2Ambulatory and capable of all self-care but unable to carry out any workactivities, up and about more than 50% of waking hours.3Capable of only limited self-care, confined to bed or chair more than 50% ofwaking hours.4Completely disabled cannot carry on any self-care, totally confined to bed orchair.5Dead

[0554] Tumor assessments will be performed according to the assessment calendar, regardless of treatment delays resulting from toxicity. Care must be taken in scheduling tumor assessments to prevent the introduction of bias based on treatment delays.

[0555] Patients will be evaluated for tumor response by CT imaging plus a bone scan at Screening and every 8 weeks (±1 week) following the start of treatment through week 24 of the study. Thereafter in patients without radiographic progression noted during the 24-week period, CT imaging and bone scans will be performed every 12 weeks (±1 week) until radiographic progression is determined. The schedule for scans will be based on calendar and not the start of a treatment cycle. Evaluations will include CT scans of chest, abdomen, pelvis, and brain (only as clinically warranted based on symptoms / findings). The Investigator, sub-Investigator, or qualified Site personnel will read the bone scans and CT images to assess whether radiographic progression has been noted. If the Investigator determines a patient's metastatic prostate cancer has progressed, the bone scans and CT images for the patient will immediately be transmitted to the Imaging Core Laboratory (ICL) for review by the Blinded Independent Central Review (BICR) to confirm radiographic progression as shown in FIG. 12.

[0556] No change in treatment should be made by the Investigator until after confirmation of disease status is received from the BICR.Blinded Independent Central Review (BICR)Screening: All scans (CT, bone, and PSMA PET), will be submitted to a third-party imaging core lab (ICL) for independent review of patient eligibility (within 3 days of receipt of imaging scans that pass quality assessment). Following confirmation by the BICR, the patient can be randomized into the study provided all other eligibility criteria have been met.

[0558] Radiographic Disease Progression: The investigator will assess the CT and bone scans to assess disease progression based upon RECIST 1.1 and PCWG3 criteria. If the investigator determines the disease progression has occurred, the BIRC, consisting of a panel two independent radiologists qualified to assess bone scans and CT images, will independently assess disease progression in accordance with RECIST 1.1 and PCWG3 criteria. Confirmation of radiographic disease progression requires agreement between the two blinded readers. If agreement between the two readers does not occur, a third reader will be utilized to adjudicate. The BICR will complete the confirmation of disease progression whenever possible within 72 hours of receipt of the image set from the Investigator demonstrative of radiographic progression. No alteration in the clinical management of the patient should be initiated by the Investigator prior to receipt of the BICR confirmation of radiographic progression. FIG. 12 presents the baseline and on-treatment disease status evaluation and treatment decisions.(ii) Patient-Reported Outcomes

[0559] Patient-reported outcomes will be determined using the European Organization for Research and Treatment of Cancer Quality of Life Questionnaire (EORTC QLQ-C30), the Functional Assessment of Cancer Therapy-Prostate (FACT-P) questionnaire, and the Brief Pain Inventory-Short Form (BPI-SF) questionnaire.

[0560] The EORTC QLQ-C30 is a questionnaire of thirty quality of life (QoL) questions developed to assess the QoL of cancer patients. The QoL questionnaire has been included in over 3,000 Phase 3 cancer clinical trials as an efficacy endpoint. The EORTC questionnaire will be administered to the patients at baseline, during treatment as provided in the Schedule of Events in Table 15, and at the end of treatment.

[0561] The Functional Assessment of Cancer Therapy-Prostate (FACT-P) is a health-related Quality of Life questionnaire with 39 prostate cancer-specific questions that evaluates: Physical Well-Being, Functional Well-Being, Emotional Well-Being, Social Well-Being, and Additional Concerns or Prostate Cancer Subscale specific...

Claims

1. A composition comprising 177Lu-Prostate-Specific Membrane Antigen Imaging and Therapy (PSMA I&T); wherein the molar ratio of the PSMA I&T to 177Lu is from 1.0:1.0 to 8.0:1.0, and the composition is suitable for administration to a human patient in need thereof for at least 72 hours after formulation.

2. The composition of claim 1, wherein the molar ratio of the PSMA I&T to 177Lu is from 2.0:1.0 to 8.0:1.0.

3. The composition of claim 1, wherein the composition has a radiochemical purity (RCP) of 95% or greater for at least 120 hours after formulation.

4. The composition of claim 1, wherein the composition is suitable for administration to a human patient in need thereof for at least 120 hours after formulation.

5. The composition of claim 1, wherein the pH of the composition is from 3.5 to 6.0.

6. The composition of claim 1, wherein the pH of the composition is from 3.5 to 5.0.

7. The composition of claim 1, wherein the pH of the composition is from 3.5 to 4.5.

8. The composition of claim 1, wherein the molar ratio of the PSMA I&T to 177Lu is from 2.0:1.0 to 7.0:1.0.

9. The composition of claim 1, wherein the molar ratio of the PSMA I&T to 177Lu is from 2.0:1.0 to 6.0:1.0.

10. The composition of claim 1, wherein the molar ratio of the PSMA I&T to 177Lu is from 2.0:1.0 to 5.0:1.0.

11. The composition of claim 1, wherein the molar ratio of the PSMA I&T to 177Lu is from 2.0:1.0 to 4.0:1.0.

12. The composition of claim 1, wherein the molar ratio of the PSMA I&T to 177Lu is from 2.0:1.0 to 2.0:1.0.

13. The composition of claim 1, wherein the molar ratio of the PSMA I&T to 177Lu is from 3.0:1.0 to 8.0:1.0.

14. The composition of claim 1, wherein the molar ratio of the PSMA I&T to 177Lu is from 3.0:1.0 to 6.0:1.0.

15. The composition of claim 1, wherein the PSMA I&T content is 30 μg / dose to 110 μg / dose.

16. The composition of claim 1, wherein Fe metal content is ≤0.05 μg / GBq.

17. The composition of claim 1, wherein Cu metal content is ≤0.05 μg / GBq.

18. The composition of claim 1, wherein Zn metal content is ≤0.05 μg / GBq.

19. The composition of claim 1, wherein Pb metal content is ≤0.05 μg / GBq.

20. The composition of claim 1, wherein the composition has a radiochemical purity (RCP) of 97.5% or greater at 72 hours after production.

21. The composition of claim 1, wherein the composition has a radiochemical purity (RCP) of 98.0% or greater at 72 hours after production.

22. The composition of claim 1, wherein the composition is suitable for human administration for 7 or more cycles of treatment.

23. The composition of claim 1, wherein the composition further comprises about 10 mg / ml to about 50 mg / ml ascorbic acid.

24. The composition of claim 1, wherein the composition further comprises at least 28 mg / ml ascorbic acid.

25. The composition of claim 1, wherein the composition further comprises DTPA.

26. The composition of claim 1, wherein the pH of the composition is from 3.5 to 6.0, the Fe metal content is ≤0.05 μg / GBq, the Cu metal content is ≤0.05 μg / GBq, the Zn metal content is ≤0.05 μg / GBq, and the Pb metal content is ≤0.05 μg / GBq.

27. A radiopharmaceutical kit comprising the composition of claim 1.

28. A composition comprising 177Lu-Prostate-Specific Membrane Antigen Imaging and Therapy (PSMA I&T); wherein the molar ratio of the PSMA I&T to 177Lu is from 2.0:1.0 to 6.0:1.0, and the composition is suitable for administration to a human patient in need thereof for at least 72 hours after formulation, and wherein the composition has a radiochemical purity (RCP) of 95% or greater for at least 72 hours after formulation.

29. The composition of claim 28, wherein the composition has a radiochemical purity (RCP) of 95% or greater for at least 120 hours after formulation.

30. A composition comprising 177Lu-Prostate-Specific Membrane Antigen Imaging and Therapy (PSMA I&T); wherein the molar ratio of the PSMA I&T to 177Lu is from 2.0:1.0 to 4.0:1.0, and the composition is suitable for administration to a human patient in need thereof for at least 72 hours after formulation, and wherein the composition has a radiochemical purity (RCP) of 97.5% or greater for at least 72 hours after formulation.

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